Package 'plspm' reference manual

Title:	Tools for Partial Least Squares Path Modeling (PLS-PM)
Description:	Partial Least Squares Path Modeling (PLS-PM) analysis for both metric and non-metric data, as well as REBUS analysis for latent class detection.
Authors:	Gaston Sanchez [aut, cre], Laura Trinchera [aut], Giorgio Russolillo [aut]
Maintainer:	Gaston Sanchez <[email protected]>
License:	GPL-3
Version:	0.4.9
Built:	2024-11-03 04:21:13 UTC
Source:	https://github.com/gastonstat/plspm

Cronbach's alpha

Description

Cronbach's alpha of a single block of variables

Usage

  alpha(X)
alpha(X)

Arguments

`X`	matrix representing one block of manifest variables

Value

Cronbach's alpha

Author(s)

Gaston Sanchez

Examples

## Not run: 
 # load dataset satisfaction
 data(satisfaction)

 # block Image (first 5 columns of satisfaction)
 Image = satisfaction[,1:5]

 # compute Cronbach's alpha for Image block
 alpha(Image)
 
## End(Not run)
## Not run: 
 # load dataset satisfaction
 data(satisfaction)

 # block Image (first 5 columns of satisfaction)
 Image = satisfaction[,1:5]

 # compute Cronbach's alpha for Image block
 alpha(Image)
 
## End(Not run)

This dataset gives the measurements of 16 vegetation communitites in the Santa Catalina Mountains, Arizona. The measurements were taken along different elevations from fir forest at high elevations, through pine forest, woodlands, and desert grassland.

Usage

arizonaarizona

Format

A data frame with 16 observations and 8 variables. The variables refer to three latent concepts: 1) ENV=environment, 2) SOIL=soil, and 3) DIV=diversity.

Num	Variable	Description	Concept
1	env.elev	Elevation (m)	environment
2	env.incli	Terrain inclination (degrees)	environment
3	soil.ph	Acidity and base saturation	soil
4	soil.orgmat	Organic matter content (perc)	soil
5	soil.nitro	Nitrogen content (perc)	soil
6	div.trees	Number of species of trees	diversity
7	div.shrubs	Numer of species of shrubs	diversity
8	div.herbs	Number of species of herbs	diversity

The complete name of the rows are: 1) Abies lasiocarpa, 2) Abies concolor, 3) Pseudotsuga menziesii-Abies Concolor, 4) Pseudotsuga menziesii, 5) Pinus ponderosa-Pinus strobiformis, 6) Pinus ponderosa, 7) Pinus ponderosa-Quercus, 8) Pinus chihuahuana, 9) Pygmy conifer-oak scrub, 10) Open oak woodland, 11) Bouteloua curtipendula, 12) Spinose-suffrutescent, 13) Cercidium microphyllum, 14) Larrea divaricata, 15) Cercocarpus breviflorus, 16) Populus tremuloides.

Source

Mixed data from Whittaker et al (1968), and Whittaker and Niering (1975). See References below.

References

Whittaker, R. H., Buol, S. W., Niering, W. A., and Havens, Y. H. (1968) A Soil and Vegetation Pattern in the Santa Catalina Mountains, Arizona. Soil Science, 105, pp. 440-450.

Whittaker, R. H., and Niering, W. A. (1975) Vegetation of the Santa Catalina Mountains, Arizona. V. Biomass, Production, and Diversity Along the Elevation Gradient. Ecology, 56, pp. 771-790.

Examples

  data(arizona)
  arizona
data(arizona)
  arizona

Cereals datset

Description

Data with several variables of different brands of cereal

Usage

data(cereals)data(cereals)

Format

A data frame with 77 observations on the following 15 variables.

mfr: Manufacturer of cereal
type: type: cold or hot
calories: calories per serving
protein: grams of protein
fat: grams of fat
sodium: milligrams of sodium
fiber: grams of dietary fiber
carbo: grams of complex carbohydrates
sugars: grams of sugars
potass: milligrams of potassium
vitamins: vitamins and minerals - 0, 25, or 100, indicating the typical percentage of FDA recommended
shelf: display shelf (1, 2, or 3, counting from the floor)
weight: weight in ounces of one serving
cups: number of cups in one serving
rating: a rating of the cereals

Source

http://lib.stat.cmu.edu/DASL/Datafiles/Cereals.html

References

http://lib.stat.cmu.edu/DASL/Stories/HealthyBreakfast.html

Examples

# load data
data(cereals)

# take a peek
head(cereals)
# load data
data(cereals)

# take a peek
head(cereals)

College datasets

Description

Dataset with different scores (high school, undergrad basic, undergrad intermediate, and GPA) of graduated college student in life sciences majors

Usage

data(college)data(college)

Format

A data frame with 352 students on the following 13 variables. The variables may be used to construct four suggested latent concepts: 1) HighSchool=High School related scores, 2) Basic=scores of basic courses, 3) InterCourse=Scores of intermediate courses, 4) GPA=Final GPA (Graduate Point Average)

Num	Variable	Description	Concept
1	`HS_GPA`	High School GPA	`HighSchool`
2	`SAT_Verbal`	Verbal SAT score	`HighSchool`
3	`SAT_Math`	Math SAT score	`HighSchool`
4	`Biology1`	Introductory Biology	`BasicCourses`
5	`Chemistry1`	Introductoy Chemistry	`BasicCourses`
6	`Math1`	Calculus 1	`BasicCourses`
7	`Physics1`	Introductory Physics	`BasicCourses`
8	`Biology2`	Intermediate Biology	`InterCourses`
9	`Chemistry2`	Intermediate Chemistry	`InterCourses`
10	`Math2`	Calculus 2	`InterCourses`
11	`Physics2`	Intermediate Physics	`InterCourses`
12	`FinalGPA`	Graduation GPA	`FinalGPA`
13	`Gender`	Gender	`none`

Examples

# load data
data(college)

# take a peek
head(college)
# load data
data(college)

# take a peek
head(college)

Futbol dataset from Spain-England-Italy

Description

This data set contains the results of the teams in the Spanish, English, and Italian football leagues 2009-2010 season.

Usage

data(futbol)data(futbol)

Format

A data frame with 60 observations on the following 12 variables. The variables may be used to construct three latent concepts: 1) ATTACK=Attack, 2) DEFENSE=Defense, 3) SUCCESS=Success.

Num	Variable	Description	Concept
1	GSH: Goals Scored at Home	total number of goals scored at home	ATTACK
2	GSA: Goals Scored Away	total number of goals scored away	ATTACK
3	SSH: Success to Score at Home	percentage of matches with scores goals at home	ATTACK
4	SSA: Success to Score Away	percentage of matches with scores goals away	ATTACK
5	NGCH: Goals Conceded at Home	total number (negative) of goals conceded at home	DEFENSE
6	NGCA: Goals Conceded Away	total number (negative) of goals conceded away	DEFENSE
7	CSH: Clean Sheets at Home	percentage of matches with no conceded goals at home	DEFENSE
8	CSA: Clean Sheets Away	percentage of matches with no conceded goals away	DEFENSE
9	WMH: Won Matches at Home	total number of matches won at home	SUCCESS
10	WMA: Won Matches Away	total number of matches won away	SUCCESS
11	Country: Leangue Country	country of the team's league	none
12	Rank: Rank Position	final ranking position within its league	none

Source

League Day. http://www.leagueday.com
Statto. http://www.statto.com

Examples

  data(futbol)
  futbol
data(futbol)
  futbol

Plot inner model

Description

Plot the inner (structural) model for objects of class "plspm", as well as path matrices

Usage

  innerplot(x, colpos = "#6890c4BB", colneg = "#f9675dBB",
    box.prop = 0.55, box.size = 0.08, box.cex = 1,
    box.col = "gray95", lcol = "gray95", box.lwd = 2,
    txt.col = "gray50", shadow.size = 0, curve = 0,
    lwd = 3, arr.pos = 0.5, arr.width = 0.2, arr.lwd = 3,
    cex.txt = 0.9, show.values = FALSE, ...)
innerplot(x, colpos = "#6890c4BB", colneg = "#f9675dBB",
    box.prop = 0.55, box.size = 0.08, box.cex = 1,
    box.col = "gray95", lcol = "gray95", box.lwd = 2,
    txt.col = "gray50", shadow.size = 0, curve = 0,
    lwd = 3, arr.pos = 0.5, arr.width = 0.2, arr.lwd = 3,
    cex.txt = 0.9, show.values = FALSE, ...)

Arguments

`x`	Either a matrix defining an inner model or an object of class `"plspm"`.
`colpos`	Color of arrows for positive path coefficients.
`colneg`	Color of arrows for negative path coefficients.
`box.prop`	Length/width ratio of ellipses.
`box.size`	Size of ellipses.
`box.cex`	Relative size of text in ellipses.
`box.col`	fill color of ellipses,
`lcol`	border color of ellipses.
`box.lwd`	line width of the box.
`txt.col`	color of text in ellipses.
`shadow.size`	Relative size of shadow of label box.
`curve`	arrow curvature.
`lwd`	line width of arrow.
`arr.pos`	Relative position of arrowheads on arrows.
`arr.width`	arrow width.
`arr.lwd`	line width of arrow, connecting two different points, (one value, or a matrix with same dimensions as `x`).
`cex.txt`	Relative size of text on arrows.
`show.values`	should values be shown when `x` is a matrix.
`...`	Further arguments passed on to `plotmat`.

Note

innerplot uses the function plotmat in package diagram.
http://cran.r-project.org/web/packages/diagram/vignettes/diagram.pdf

Iterative steps of Response-Based Unit Segmentation (REBUS)

Description

REBUS-PLS is an iterative algorithm for performing response based clustering in a PLS-PM framework. it.reb allows to perform the iterative steps of the REBUS-PLS Algorithm. It provides summarized results for final local models and the final partition of the units. Before running this function, it is necessary to run the res.clus function to choose the number of classes to take into account.

Usage

  it.reb(pls, hclus.res, nk, Y = NULL, stop.crit = 0.005,
    iter.max = 100)
it.reb(pls, hclus.res, nk, Y = NULL, stop.crit = 0.005,
    iter.max = 100)

Arguments

`pls`	an object of class `"plspm"`
`hclus.res`	object of class `"res.clus"` returned by `res.clus`
`nk`	integer larger than 1 indicating the number of classes. This value should be defined according to the dendrogram obtained by performing `res.clus`.
`Y`	optional data matrix used when `pls$data` is `NULL`
`stop.crit`	Number indicating the stop criterion for the iterative algorithm. It is suggested to use the threshold of less than 0.05% of units changing class from one iteration to the other as stopping rule.
`iter.max`	integer indicating the maximum number of iterations

Value

an object of class "rebus"

`loadings`	Matrix of standardized loadings (i.e. correlations with LVs.) for each local model
`path.coefs`	Matrix of path coefficients for each local model
`quality`	Matrix containing the average communalities, the average redundancies, the R2 values, and the GoF index for each local model
`segments`	Vector defining the class membership of each unit
`origdata.clas`	The numeric matrix with original data and with a new column defining class membership of each unit

Author(s)

Laura Trinchera, Gaston Sanchez

References

Esposito Vinzi, V., Trinchera, L., Squillacciotti, S., and Tenenhaus, M. (2008) REBUS-PLS: A Response-Based Procedure for detecting Unit Segments in PLS Path Modeling. Applied Stochastic Models in Business and Industry (ASMBI), 24, pp. 439-458.

Trinchera, L. (2007) Unobserved Heterogeneity in Structural Equation Models: a new approach to latent class detection in PLS Path Modeling. Ph.D. Thesis, University of Naples "Federico II", Naples, Italy.

http://www.fedoa.unina.it/2702/1/Trinchera_Statistica.pdf

Examples

## Not run: 
## Example of REBUS PLS with simulated data

# load simdata
data("simdata", package='plspm')

# Calculate global plspm
sim_inner = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
dimnames(sim_inner) = list(c("Price", "Quality", "Satisfaction"),
                           c("Price", "Quality", "Satisfaction"))
sim_outer = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
sim_mod = c("A", "A", "A")  # reflective indicators
sim_global = plspm(simdata, sim_inner,
                   sim_outer, modes=sim_mod)
sim_global

## Then compute cluster analysis on residuals of global model
sim_clus = res.clus(sim_global)

## To complete REBUS, run iterative algorithm
rebus_sim = it.reb(sim_global, sim_clus, nk=2,
                   stop.crit=0.005, iter.max=100)

## You can also compute complete outputs
## for local models by running:
local_rebus = local.models(sim_global, rebus_sim)

# Display plspm summary for first local model
summary(local_rebus$loc.model.1)

## End(Not run)
## Not run: 
## Example of REBUS PLS with simulated data

# load simdata
data("simdata", package='plspm')

# Calculate global plspm
sim_inner = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
dimnames(sim_inner) = list(c("Price", "Quality", "Satisfaction"),
                           c("Price", "Quality", "Satisfaction"))
sim_outer = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
sim_mod = c("A", "A", "A")  # reflective indicators
sim_global = plspm(simdata, sim_inner,
                   sim_outer, modes=sim_mod)
sim_global

## Then compute cluster analysis on residuals of global model
sim_clus = res.clus(sim_global)

## To complete REBUS, run iterative algorithm
rebus_sim = it.reb(sim_global, sim_clus, nk=2,
                   stop.crit=0.005, iter.max=100)

## You can also compute complete outputs
## for local models by running:
local_rebus = local.models(sim_global, rebus_sim)

# Display plspm summary for first local model
summary(local_rebus$loc.model.1)

## End(Not run)

PLS-PM for global and local models

Description

Calculates PLS-PM for global and local models from a given partition

Usage

  local.models(pls, y, Y = NULL)
local.models(pls, y, Y = NULL)

Arguments

`pls`	An object of class `"plspm"`
`y`	One object of the following classes: `"rebus"`, `"integer"`, or `"factor"`, that provides the class partitions.
`Y`	Optional dataset (matrix or data frame) used when argument `dataset=NULL` inside `pls`.

Details

local.models calculates PLS-PM for the global model (i.e. over all observations) as well as PLS-PM for local models (i.e. observations of different partitions).

When y is an object of class "rebus", local.models is applied to the classes obtained from the REBUS algorithm.

When y is an integer vector or a factor, the values or levels are assumed to represent the group to which each observation belongs. In this case, the function local.models calculates PLS-PM for the global model, as well as PLS-PM for each group (local models).

When the object pls does not contain a data matrix (i.e. pls$data=NULL), the user must provide the data matrix or data frame in Y.

The original parameters modes, scheme, scaled, tol, and iter from the object pls are taken.

Value

An object of class "local.models", basically a list of length k+1, where k is the number of classes.

`glob.model`	PLS-PM of the global model
`loc.model.1`	PLS-PM of segment (class) 1
`loc.model.2`	PLS-PM of segment (class) 2
`loc.model.k`	PLS-PM of segment (class) k

Note

Each element of the list is an object of class "plspm". Thus, in order to examine the results for each local model, it is necessary to use the summary function.

Author(s)

Laura Trinchera, Gaston Sanchez

Examples

## Not run: 
## Example of REBUS PLS with simulated data

# load simdata
data("simdata", package='plspm')

# Calculate global plspm
sim_inner = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
dimnames(sim_inner) = list(c("Price", "Quality", "Satisfaction"),
                           c("Price", "Quality", "Satisfaction"))
sim_outer = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
sim_mod = c("A", "A", "A")  # reflective indicators
sim_global = plspm(simdata, sim_inner,
                   sim_outer, modes=sim_mod)
sim_global

## Then compute cluster analysis on residuals of global model
sim_clus = res.clus(sim_global)

## To complete REBUS, run iterative algorithm
rebus_sim = it.reb(sim_global, sim_clus, nk=2,
                   stop.crit=0.005, iter.max=100)

## You can also compute complete outputs
## for local models by running:
local_rebus = local.models(sim_global, rebus_sim)

# Display plspm summary for first local model
summary(local_rebus$loc.model.1)

## End(Not run)
## Not run: 
## Example of REBUS PLS with simulated data

# load simdata
data("simdata", package='plspm')

# Calculate global plspm
sim_inner = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
dimnames(sim_inner) = list(c("Price", "Quality", "Satisfaction"),
                           c("Price", "Quality", "Satisfaction"))
sim_outer = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
sim_mod = c("A", "A", "A")  # reflective indicators
sim_global = plspm(simdata, sim_inner,
                   sim_outer, modes=sim_mod)
sim_global

## Then compute cluster analysis on residuals of global model
sim_clus = res.clus(sim_global)

## To complete REBUS, run iterative algorithm
rebus_sim = it.reb(sim_global, sim_clus, nk=2,
                   stop.crit=0.005, iter.max=100)

## You can also compute complete outputs
## for local models by running:
local_rebus = local.models(sim_global, rebus_sim)

# Display plspm summary for first local model
summary(local_rebus$loc.model.1)

## End(Not run)

ECSI Mobile Phone Provider dataset

Description

This table contains data from the article by Tenenhaus et al. (2005), see reference below.

Usage

data(mobile)data(mobile)

Format

A data frame with 250 observations on 24 variables on a scale from 0 to 100. The variables refer to seven latent concepts: 1) IMAG=Image, 2) EXPE=Expectations, 3) QUAL=Quality, 4) VAL=Value, 5) SAT=Satisfaction, 6) COM=Complaints, and 7) LOY=Loyalty.

IMAG: Includes variables such as reputation, trustworthiness, seriousness, and caring about customer's needs.
EXPE: Includes variables such as products and services provided and expectations for the overall quality.
QUAL: Includes variables such as reliable products and services, range of products and services, and overall perceived quality.
VAL: Includes variables such as quality relative to price, and price relative to quality.
SAT: Includes variables such as overall rating of satisfaction, fulfillment of expectations, satisfaction relative to other phone providers.
COM: Includes one variable defining how well or poorly custmer's complaints were handled.
LOY: Includes variables such as propensity to choose the same phone provider again, propensity to switch to other phone provider, intention to recommend the phone provider to friends.

ima1: First MV of the block Image
ima2: Second MV of the block Image
ima3: Third MV of the block Image
ima4: Fourth MV of the block Image
ima5: Fifth MV of the block Image
exp1: First MV of the block Expectations
exp2: Second MV of the block Expectations
exp3: Third MV of the block Expectations
qua1: First MV of the block Quality
qua2: Second MV of the block Quality
qua3: Third MV of the block Quality
qua4: Fourth MV of the block Quality
qua5: Fifth MV of the block Quality
qua6: Sixth MV of the block Quality
qua7: Seventh MV of the block Quality
val1: First MV of the block Value
val2: Second MV of the block Value
sat1: First MV of the block Satisfaction
sat2: Second MV of the block Satisfaction
sat3: Third MV of the block Satisfaction
comp: First MV of the block Complaints
loy1: First MV of the block Loyalty
loy2: Second MV of the block Loyalty
loy3: Third MV of the block Loyalty

References

Tenenhaus, M., Esposito Vinzi, V., Chatelin Y.M., and Lauro, C. (2005) PLS path modeling. Computational Statistics & Data Analysis, 48, pp. 159-205.

Examples

data(mobile)
data(mobile)

Offense dataset

Description

Dataset with offense statistics of American football teams from the NFL (2010-2011 season).

Usage

data(offense)data(offense)

Format

A data frame with 32 teams on the following 17 variables. The variables may be used to construct five suggested latent concepts: 1) RUSH=Rushing Quality, 2) PASS=Passing Quality, 3) SPEC=Special Teams and Other, 4) SCORING=Scoring Success, 5)OFFENSE=Offense Performance

Num	Variable	Description	Concept
1	`YardsRushAtt`	Yards per Rush Attempt	`RUSH`
2	`RushYards`	Rush Yards per game	`RUSH`
3	`RushFirstDown`	Rush First Downs per game	`RUSH`
4	`YardsPassComp`	Yards Pass Completion	`PASS`
5	`PassYards`	Passed Yards per game	`PASS`
6	`PassFirstDown`	Pass First Downs per game	`PASS`
7	`FieldGoals`	Field Goals per game	`SPEC`
8	`OtherTDs`	Other Touchdowns (non-offense) per game	`SPEC`
9	`PointsGame`	Points per game	`SCORING`
10	`OffensTD`	Offense Touchdowns per game	`SCORING`
11	`TDGame`	Touchdowns per game	`SCORING`
12	`PassTDG`	Passing Touchdowns per game	`OFFENSE`
13	`RushTDG`	Rushing Touchdowns per game	`OFFENSE`
14	`PlaysGame`	Plays per game	`OFFENSE`
15	`YardsPlay`	Yards per Play	`OFFENSE`
16	`FirstDownPlay`	First Downs per Play	`OFFENSE`
17	`OffTimePossPerc`	Offense Time Possession Percentage	`OFFENSE`

Source

http://www.teamrankings.com/nfl/stats/

Examples

# load data
data(offense)

# take a peek
head(offense)
# load data
data(offense)

# take a peek
head(offense)

Orange Juice dataset

Description

This data set contains the physico-chemical, sensory and hedonic measurements of 6 orange juices.

Usage

orangeorange

Format

A data frame with 6 observations and 112 variables. The variables refer to three latent concepts: 1) PHYCHEM=Physico-Chemical, 2) SENSORY=Sensory, and 3) HEDONIC=Hedonic.

Num	Variable	Description	Concept
1	glucose	Glucose (g/l)	physico-chemical
2	fructose	Fructose (g/l)	physico-chemical
3	saccharose	Saccharose (g/l)	physico-chemical
4	sweet.power	Sweetening power (g/l)	physico-chemical
5	ph1	pH before processing	physico-chemical
6	ph2	pH after centrifugation	physico-chemical
7	titre	Titre (meq/l)	physico-chemical
8	citric.acid	Citric acid (g/l)	physico-chemical
9	vitamin.c	Vitamin C (mg/100g)	physico-chemical
10	smell.int	Smell intensity	sensory
11	odor.typi	Odor typicity	sensory
12	pulp	Pulp	sensory
13	taste.int	Taste intensity	sensory
14	acidity	Acidity	sensory
15	bitter	Bitterness	sensory
16	sweet	Sweetness	sensory
17	judge1	Ratings of judge 1	hedonic
18	judge2	Ratings of judge 2	hedonic
...	...	...	...
112	judge96	Ratings of judge 96	hedonic

Source

Laboratoire de Mathematiques Appliques, Agrocampus, Rennes.

References

Tenenhaus, M., Pages, J., Ambroisine, L., and Guinot, C. (2005) PLS methodology to study relationships between hedonic jedgements and product characteristics. Food Quality and Preference, 16(4), pp. 315-325.

Pages, J., and Tenenhaus, M. (2001) Multiple factor analysis combined with PLS path modelling. Application to the analysis of relationships between physicochemical, sensory profiles and hedonic judgements. Chemometrics and Intelligent Laboratory Systems, 58, pp. 261-273.

Pages, J. (2004) Multiple Factor Analysis: Main Features and Application to Sensory Data. Revista Colombiana de Estadistica, 27, pp. 1-26.

Examples

  data(orange)
  orange
data(orange)
  orange

Plot outer model

Description

Plot either outer weights or loadings in the outer model for objects of class "plspm"

Usage

  outerplot(x, what = "loadings", colpos = "#6890c4BB",
    colneg = "#f9675dBB", box.prop = 0.55, box.size = 0.08,
    box.cex = 1, box.col = "gray95", lcol = "gray95",
    box.lwd = 2, txt.col = "gray40", shadow.size = 0,
    curve = 0, lwd = 2, arr.pos = 0.5, arr.width = 0.15,
    cex.txt = 0.9, ...)
outerplot(x, what = "loadings", colpos = "#6890c4BB",
    colneg = "#f9675dBB", box.prop = 0.55, box.size = 0.08,
    box.cex = 1, box.col = "gray95", lcol = "gray95",
    box.lwd = 2, txt.col = "gray40", shadow.size = 0,
    curve = 0, lwd = 2, arr.pos = 0.5, arr.width = 0.15,
    cex.txt = 0.9, ...)

Arguments

`x`	An object of class `"plspm"`.
`what`	What to plot: `"loadings"` or `"weights"`.
`colpos`	Color of arrows for positive path coefficients.
`colneg`	Color of arrows for negative path coefficients.
`box.prop`	Length/width ratio of ellipses and rectangles.
`box.size`	Size of ellipses and rectangles.
`box.cex`	Relative size of text in ellipses and rectangles.
`box.col`	fill color of ellipses and rectangles.
`lcol`	border color of ellipses and rectangles.
`box.lwd`	line width of the box.
`txt.col`	color of text in ellipses and rectangles.
`shadow.size`	Relative size of shadow of label box.
`curve`	arrow curvature.
`lwd`	line width of arrow.
`arr.pos`	Relative position of arrowheads on arrows.
`arr.width`	arrow width.
`cex.txt`	Relative size of text on arrows.
`...`	Further arguments passed on to `plotmat`.

Note

outerplot uses the function plotmat of package diagram.
http://cran.r-project.org/web/packages/diagram/vignettes/diagram.pdf

Plots for PLS Path Models

Description

Plot method for objects of class "plspm". This function plots either the inner (i.e. structural) model with the estimated path coefficients, or the outer (i.e. measurement) model with loadings or weights.

Usage

  ## S3 method for class 'plspm'
 plot(x, what = "inner",
    colpos = "#6890c4BB", colneg = "#f9675dBB",
    box.prop = 0.55, box.size = 0.08, box.cex = 1,
    box.col = "gray95", lcol = "gray95",
    txt.col = "gray40", arr.pos = 0.5, cex.txt = 0.9, ...)
## S3 method for class 'plspm'
 plot(x, what = "inner",
    colpos = "#6890c4BB", colneg = "#f9675dBB",
    box.prop = 0.55, box.size = 0.08, box.cex = 1,
    box.col = "gray95", lcol = "gray95",
    txt.col = "gray40", arr.pos = 0.5, cex.txt = 0.9, ...)

Arguments

`x`	An object of class `"plspm"`.
`what`	What to plot: `"inner"`, `"loadings"`, `"weights"`.
`colpos`	Color of arrows for positive path coefficients.
`colneg`	Color of arrows for negative path coefficients.
`box.prop`	Length/width ratio of ellipses and rectangles.
`box.size`	Size of ellipses and rectangles.
`box.cex`	Relative size of text in ellipses and rectangles.
`box.col`	fill color of ellipses and rectangles.
`lcol`	border color of ellipses and rectangles.
`txt.col`	color of text in ellipses and rectangles.
`arr.pos`	Relative position of arrowheads on arrows.
`cex.txt`	Relative size of text on arrows.
`...`	Further arguments passed on to `plotmat`.

Details

plot.plspm is just a wraper of innerplot and outerplot.

Note

Function plot.plspm is based on the function plotmat of package diagram.
http://cran.r-project.org/web/packages/diagram/vignettes/diagram.pdf

Examples

## Not run: 
 ## typical example of PLS-PM in customer satisfaction analysis
 ## model with six LVs and reflective indicators
 # load data satisfaction
 data(satisfaction)

 # define inner model matrix
 IMAG = c(0,0,0,0,0,0)
 EXPE = c(1,0,0,0,0,0)
 QUAL = c(0,1,0,0,0,0)
 VAL = c(0,1,1,0,0,0)
 SAT = c(1,1,1,1,0,0)
 LOY = c(1,0,0,0,1,0)
 sat.inner = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

 # define outer model list
 sat.outer = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

 # define vector of reflective modes
 sat.mod = rep("A", 6)

 # apply plspm
 satpls = plspm(satisfaction, sat.inner, sat.outer, sat.mod, scheme="centroid",
               scaled=FALSE)

 # plot path coefficients
 plot(satpls, what="inner")

 # plot loadings
 plot(satpls, what="loadings")

 # plot outer weights
 plot(satpls, what="weights")
 
## End(Not run)
## Not run: 
 ## typical example of PLS-PM in customer satisfaction analysis
 ## model with six LVs and reflective indicators
 # load data satisfaction
 data(satisfaction)

 # define inner model matrix
 IMAG = c(0,0,0,0,0,0)
 EXPE = c(1,0,0,0,0,0)
 QUAL = c(0,1,0,0,0,0)
 VAL = c(0,1,1,0,0,0)
 SAT = c(1,1,1,1,0,0)
 LOY = c(1,0,0,0,1,0)
 sat.inner = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

 # define outer model list
 sat.outer = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

 # define vector of reflective modes
 sat.mod = rep("A", 6)

 # apply plspm
 satpls = plspm(satisfaction, sat.inner, sat.outer, sat.mod, scheme="centroid",
               scaled=FALSE)

 # plot path coefficients
 plot(satpls, what="inner")

 # plot loadings
 plot(satpls, what="loadings")

 # plot outer weights
 plot(satpls, what="weights")
 
## End(Not run)

PLS-PM: Partial Least Squares Path Modeling

Description

Estimate path models with latent variables by partial least squares approach (for both metric and non-metric data)

Usage

  plspm(Data, path_matrix, blocks, modes = NULL,
    scaling = NULL, scheme = "centroid", scaled = TRUE,
    tol = 1e-06, maxiter = 100, plscomp = NULL,
    boot.val = FALSE, br = NULL, dataset = TRUE)
plspm(Data, path_matrix, blocks, modes = NULL,
    scaling = NULL, scheme = "centroid", scaled = TRUE,
    tol = 1e-06, maxiter = 100, plscomp = NULL,
    boot.val = FALSE, br = NULL, dataset = TRUE)

Arguments

`Data`	matrix or data frame containing the manifest variables.
`path_matrix`	A square (lower triangular) boolean matrix representing the inner model (i.e. the path relationships between latent variables).
`blocks`	list of vectors with column indices or column names from `Data` indicating the sets of manifest variables forming each block (i.e. which manifest variables correspond to each block).
`scaling`	optional argument for runing the non-metric approach; it is a list of string vectors indicating the type of measurement scale for each manifest variable specified in `blocks`. `scaling` must be specified when working with non-metric variables. Possible values: `"num"` (linear transformation, suitable for numerical variables), `"raw"` (no transformation), `"nom"` (non-monotonic transformation, suitable for nominal variables), and `"ord"` (monotonic transformation, suitable for ordinal variables).
`modes`	character vector indicating the type of measurement for each block. Possible values are: `"A", "B", "newA", "PLScore", "PLScow"`. The length of `modes` must be equal to the length of `blocks`.
`scheme`	string indicating the type of inner weighting scheme. Possible values are `"centroid"`, `"factorial"`, or `"path"`.
`scaled`	whether manifest variables should be standardized. Only used when `scaling = NULL`. When (`TRUE`, data is scaled to standardized values (mean=0 and variance=1). The variance is calculated dividing by `N` instead of `N-1`).
`tol`	decimal value indicating the tolerance criterion for the iterations (`tol=0.000001`). Can be specified between 0 and 0.001.
`maxiter`	integer indicating the maximum number of iterations (`maxiter=100` by default). The minimum value of `maxiter` is 100.
`plscomp`	optional vector indicating the number of PLS components (for each block) to be used when handling non-metric data (only used if `scaling` is provided)
`boot.val`	whether bootstrap validation should be performed. (`FALSE` by default).
`br`	number bootstrap resamples. Used only when `boot.val=TRUE`. When `boot.val=TRUE`, the default number of re-samples is 100.
`dataset`	whether the data matrix used in the computations should be retrieved (`TRUE` by default).

Details

The function plspm estimates a path model by partial least squares approach providing the full set of results.

The argument path_matrix is a matrix of zeros and ones that indicates the structural relationships between latent variables. path_matrix must be a lower triangular matrix; it contains a 1 when column j affects row i, 0 otherwise.

plspm: Partial Least Squares Path Modeling
plspm.fit: Simple version for PLS-PM
plspm.groups: Two Groups Comparison in PLS-PM
rebus.pls: Response Based Unit Segmentation (REBUS)

Value

An object of class "plspm".

`outer_model`	Results of the outer model. Includes: outer weights, standardized loadings, communalities, and redundancies
`inner_model`	Results of the inner (structural) model. Includes: path coeffs and R-squared for each endogenous latent variable
`scores`	Matrix of latent variables used to estimate the inner model. If `scaled=FALSE` then `scores` are latent variables calculated with the original data (non-stardardized).
`path_coefs`	Matrix of path coefficients (this matrix has a similar form as `path_matrix`)
`crossloadings`	Correlations between the latent variables and the manifest variables (also called crossloadings)
`inner_summary`	Summarized results of the inner model. Includes: type of LV, type of measurement, number of indicators, R-squared, average communality, average redundancy, and average variance extracted
`effects`	Path effects of the structural relationships. Includes: direct, indirect, and total effects
`unidim`	Results for checking the unidimensionality of blocks (These results are only meaningful for reflective blocks)
`gof`	Goodness-of-Fit index
`data`	Data matrix containing the manifest variables used in the model. Only available when `dataset=TRUE`
`boot`	List of bootstrapping results; only available when argument `boot.val=TRUE`

Author(s)

Gaston Sanchez, Giorgio Russolillo

References

Tenenhaus M., Esposito Vinzi V., Chatelin Y.M., and Lauro C. (2005) PLS path modeling. Computational Statistics & Data Analysis, 48, pp. 159-205.

Lohmoller J.-B. (1989) Latent variables path modeling with partial least squares. Heidelberg: Physica-Verlag.

Wold H. (1985) Partial Least Squares. In: Kotz, S., Johnson, N.L. (Eds.), Encyclopedia of Statistical Sciences, Vol. 6. Wiley, New York, pp. 581-591.

Wold H. (1982) Soft modeling: the basic design and some extensions. In: K.G. Joreskog & H. Wold (Eds.), Systems under indirect observations: Causality, structure, prediction, Part 2, pp. 1-54. Amsterdam: Holland.

Russolillo, G. (2012) Non-Metric Partial Least Squares. Electronic Journal of Statistics, 6, pp. 1641-1669. http://projecteuclid.org/euclid.ejs/1348665231

Examples

## Not run: 
## typical example of PLS-PM in customer satisfaction analysis
## model with six LVs and reflective indicators

# load dataset satisfaction
data(satisfaction)

# path matrix
IMAG = c(0,0,0,0,0,0)
EXPE = c(1,0,0,0,0,0)
QUAL = c(0,1,0,0,0,0)
VAL = c(0,1,1,0,0,0)
SAT = c(1,1,1,1,0,0)
LOY = c(1,0,0,0,1,0)
sat_path = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

# plot diagram of path matrix
innerplot(sat_path)

# blocks of outer model
sat_blocks = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

# vector of modes (reflective indicators)
sat_mod = rep("A", 6)

# apply plspm
satpls = plspm(satisfaction, sat_path, sat_blocks, modes = sat_mod,
   scaled = FALSE)

# plot diagram of the inner model
innerplot(satpls)

# plot loadings
outerplot(satpls, what = "loadings")

# plot outer weights
outerplot(satpls, what = "weights")

## End(Not run)
## Not run: 
## typical example of PLS-PM in customer satisfaction analysis
## model with six LVs and reflective indicators

# load dataset satisfaction
data(satisfaction)

# path matrix
IMAG = c(0,0,0,0,0,0)
EXPE = c(1,0,0,0,0,0)
QUAL = c(0,1,0,0,0,0)
VAL = c(0,1,1,0,0,0)
SAT = c(1,1,1,1,0,0)
LOY = c(1,0,0,0,1,0)
sat_path = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

# plot diagram of path matrix
innerplot(sat_path)

# blocks of outer model
sat_blocks = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

# vector of modes (reflective indicators)
sat_mod = rep("A", 6)

# apply plspm
satpls = plspm(satisfaction, sat_path, sat_blocks, modes = sat_mod,
   scaled = FALSE)

# plot diagram of the inner model
innerplot(satpls)

# plot loadings
outerplot(satpls, what = "loadings")

# plot outer weights
outerplot(satpls, what = "weights")

## End(Not run)

Basic results for Partial Least Squares Path Modeling

Description

Estimate path models with latent variables by partial least squares approach without providing the full list of results as plspm(). This might be helpful when doing simulations, intensive computations, or when you don't want the whole enchilada.

Usage

  plspm.fit(Data, path_matrix, blocks, modes = NULL,
    scaling = NULL, scheme = "centroid", scaled = TRUE,
    tol = 1e-06, maxiter = 100, plscomp = NULL)
plspm.fit(Data, path_matrix, blocks, modes = NULL,
    scaling = NULL, scheme = "centroid", scaled = TRUE,
    tol = 1e-06, maxiter = 100, plscomp = NULL)

Arguments

`Data`	matrix or data frame containing the manifest variables.
`path_matrix`	A square (lower triangular) boolean matrix representing the inner model (i.e. the path relationships betwenn latent variables).
`blocks`	list of vectors with column indices or column names from `Data` indicating the sets of manifest variables forming each block (i.e. which manifest variables correspond to each block).
`scaling`	optional list of string vectors indicating the type of measurement scale for each manifest variable specified in `blocks`. `scaling` must be specified when working with non-metric variables.
`modes`	character vector indicating the type of measurement for each block. Possible values are: `"A", "B", "newA", "PLScore", "PLScow"`. The length of `modes` must be equal to the length of `blocks`.
`scheme`	string indicating the type of inner weighting scheme. Possible values are `"centroid"`, `"factorial"`, or `"path"`.
`scaled`	whether manifest variables should be standardized. Only used when `scaling = NULL`. When (`TRUE` data is scaled to standardized values (mean=0 and variance=1). The variance is calculated dividing by `N` instead of `N-1`).
`tol`	decimal value indicating the tolerance criterion for the iterations (`tol=0.000001`). Can be specified between 0 and 0.001.
`maxiter`	integer indicating the maximum number of iterations (`maxiter=100` by default). The minimum value of `maxiter` is 100.
`plscomp`	optional vector indicating the number of PLS components (for each block) to be used when handling non-metric data (only used if `scaling` is provided)

Details

plspm.fit performs the basic PLS algorithm and provides limited results (e.g. outer model, inner model, scores, and path coefficients).

Value

An object of class "plspm".

`outer_model`	Results of the outer model. Includes: outer weights, standardized loadings, communalities, and redundancies
`inner_model`	Results of the inner (structural) model. Includes: path coeffs and R-squared for each endogenous latent variable
`scores`	Matrix of latent variables used to estimate the inner model. If `scaled=FALSE` then `scores` are latent variables calculated with the original data (non-stardardized). If `scaled=TRUE` then `scores` and `latents` have the same values
`path_coefs`	Matrix of path coefficients (this matrix has a similar form as `path_matrix`)

Author(s)

Gaston Sanchez, Giorgio Russolillo

References

Tenenhaus M., Esposito Vinzi V., Chatelin Y.M., and Lauro C. (2005) PLS path modeling. Computational Statistics & Data Analysis, 48, pp. 159-205.

Lohmoller J.-B. (1989) Latent variables path modeling with partial least squares. Heidelberg: Physica-Verlag.

Wold H. (1985) Partial Least Squares. In: Kotz, S., Johnson, N.L. (Eds.), Encyclopedia of Statistical Sciences, Vol. 6. Wiley, New York, pp. 581-591.

Examples

## Not run: 
 ## typical example of PLS-PM in customer satisfaction analysis
 ## model with six LVs and reflective indicators

 # load dataset satisfaction
 data(satisfaction)

 # inner model matrix
 IMAG = c(0,0,0,0,0,0)
 EXPE = c(1,0,0,0,0,0)
 QUAL = c(0,1,0,0,0,0)
 VAL = c(0,1,1,0,0,0)
 SAT = c(1,1,1,1,0,0)
 LOY = c(1,0,0,0,1,0)
 sat_path = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

 # outer model list
 sat_blocks = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

 # vector of reflective modes
 sat_modes = rep("A", 6)

 # apply plspm.fit
 satpls = plspm.fit(satisfaction, sat_path, sat_blocks, sat_modes,
     scaled=FALSE)

 # summary of results
 summary(satpls)

 # default plot (inner model)
 plot(satpls)
 
## End(Not run)
## Not run: 
 ## typical example of PLS-PM in customer satisfaction analysis
 ## model with six LVs and reflective indicators

 # load dataset satisfaction
 data(satisfaction)

 # inner model matrix
 IMAG = c(0,0,0,0,0,0)
 EXPE = c(1,0,0,0,0,0)
 QUAL = c(0,1,0,0,0,0)
 VAL = c(0,1,1,0,0,0)
 SAT = c(1,1,1,1,0,0)
 LOY = c(1,0,0,0,1,0)
 sat_path = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

 # outer model list
 sat_blocks = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

 # vector of reflective modes
 sat_modes = rep("A", 6)

 # apply plspm.fit
 satpls = plspm.fit(satisfaction, sat_path, sat_blocks, sat_modes,
     scaled=FALSE)

 # summary of results
 summary(satpls)

 # default plot (inner model)
 plot(satpls)
 
## End(Not run)

Two Groups Comparison in PLS-PM

Description

Performs a group comparison test for comparing path coefficients between two groups. The null and alternative hypotheses to be tested are: H0: path coefficients are not significantly different; H1: path coefficients are significantly different

Usage

  plspm.groups(pls, group, Y = NULL, method = "bootstrap",
    reps = NULL)
plspm.groups(pls, group, Y = NULL, method = "bootstrap",
    reps = NULL)

Arguments

`pls`	object of class `"plspm"`
`group`	factor with 2 levels indicating the groups to be compared
`Y`	optional dataset (matrix or data frame) used when argument `dataset=NULL` inside `pls`.
`method`	method to be used in the test. Possible values are `"bootstrap"` or `"permutation"`
`reps`	integer indicating the number of either bootstrap resamples or number of permutations. If `NULL` then `reps`=100

Details

plspm.groups performs a two groups comparison test in PLS-PM for comparing path coefficients between two groups. Only two methods are available: 1) bootstrap, and 2) permutation. The bootstrap test is an adapted t-test based on bootstrap standard errors. The permutation test is a randomization test which provides a non-parametric option.

When the object pls does not contain a data matrix (i.e. pls$data=NULL), the user must provide the data matrix or data frame in Y.

Value

An object of class "plspm.groups"

`test`	Table with the results of the applied test. Includes: path coefficients of the global model, path coeffs of group1, path coeffs of group2, (absolute) difference of path coeffs between groups, and the test results with the p-value.
`global`	List with inner model results for the global model
`group1`	List with inner model results for group1
`group2`	List with inner model results for group2

Author(s)

Gaston Sanchez

References

Chin, W.W. (2003) A permutation procedure for multi-group comparison of PLS models. In: Vilares M., Tenenhaus M., Coelho P., Esposito Vinzi V., Morineau A. (Eds.) PLS and Related Methods - Proceedings of the International Symposium PLS03. Decisia, pp. 33-43.

Chin, W.W. (2000) Frequently Asked Questions, Partial Least Squares PLS-Graph. Available from: http://disc-nt.cba.uh.edu/chin/plsfaq/multigroup.htm

Examples

## Not run: 
 ## example with customer satisfaction analysis
 ## group comparison based on the segmentation variable "gender"

 # load data satisfaction
 data(satisfaction)

 # define inner model matrix
 IMAG = c(0,0,0,0,0,0)
 EXPE = c(1,0,0,0,0,0)
 QUAL = c(0,1,0,0,0,0)
 VAL = c(0,1,1,0,0,0)
 SAT = c(1,1,1,1,0,0)
 LOY = c(1,0,0,0,1,0)
 sat_path = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

 # define outer model list
 sat_blocks = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

 # define vector of reflective modes
 sat_mod = rep("A", 6)

 # apply plspm
 satpls = plspm(satisfaction, sat_path, sat_blocks,
                modes = sat_mod, scaled = FALSE)

 # permutation test with 100 permutations
 group_perm = plspm.groups(satpls, satisfaction$gender,
                           method="permutation", reps=100)
 group_perm
 
## End(Not run)
## Not run: 
 ## example with customer satisfaction analysis
 ## group comparison based on the segmentation variable "gender"

 # load data satisfaction
 data(satisfaction)

 # define inner model matrix
 IMAG = c(0,0,0,0,0,0)
 EXPE = c(1,0,0,0,0,0)
 QUAL = c(0,1,0,0,0,0)
 VAL = c(0,1,1,0,0,0)
 SAT = c(1,1,1,1,0,0)
 LOY = c(1,0,0,0,1,0)
 sat_path = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

 # define outer model list
 sat_blocks = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

 # define vector of reflective modes
 sat_mod = rep("A", 6)

 # apply plspm
 satpls = plspm(satisfaction, sat_path, sat_blocks,
                modes = sat_mod, scaled = FALSE)

 # permutation test with 100 permutations
 group_perm = plspm.groups(satpls, satisfaction$gender,
                           method="permutation", reps=100)
 group_perm
 
## End(Not run)

Quantification Plot

Description

Quantification Plots for Non-Metric PLS-PM

Usage

  quantiplot(pls, lv = NULL, mv = NULL, pch = 16,
    col = "darkblue", lty = 2, ...)
quantiplot(pls, lv = NULL, mv = NULL, pch = 16,
    col = "darkblue", lty = 2, ...)

Arguments

`pls`	a non-metric `"plspm"` object
`lv`	number or name of latent variable
`mv`	number or name of manifest variable
`pch`	Either an integer specifying a symbol or a single character to be used as the default in plotting points
`col`	color
`lty`	type of line
`...`	Further arguments passed on to `plot`.

Details

If both lv and mv are specified, only the value of lv will be taken into account.
If the given lv have more than 15 variables, only the first 15 are plotted.

Response Based Unit Segmentation (REBUS)

Description

Performs all the steps of the REBUS-PLS algorithm. Starting from the global model, REBUS allows us to detect local models with better performance.

Usage

  rebus.pls(pls, Y = NULL, stop.crit = 0.005,
    iter.max = 100)
rebus.pls(pls, Y = NULL, stop.crit = 0.005,
    iter.max = 100)

Arguments

`pls`	Object of class `"plspm"`
`Y`	Optional dataset (matrix or data frame) used when argument `dataset=NULL` inside `pls`.
`stop.crit`	Number indicating the stop criterion for the iterative algorithm. Use a threshold of less than 0.05% of units changing class from one iteration to the other as stopping rule.
`iter.max`	integer indicating the maximum number of iterations.

Value

An object of class "rebus", basically a list with:

`loadings`	Matrix of standardized loadings (i.e. correlations with LVs.) for each local model.
`path.coefs`	Matrix of path coefficients for each local model.
`quality`	Matrix containing the average communalities, average redundancies, R2 values, and GoF values for each local model.
`segments`	Vector defining for each unit the class membership.
`origdata.clas`	The numeric matrix with original data and with a new column defining class membership of each unit.

Author(s)

Laura Trinchera, Gaston Sanchez

References

Esposito Vinzi V., Trinchera L., Squillacciotti S., and Tenenhaus M. (2008) REBUS-PLS: A Response-Based Procedure for detecting Unit Segments in PLS Path Modeling. Applied Stochastic Models in Business and Industry (ASMBI), 24, pp. 439-458.

http://www.fedoa.unina.it/2702/1/Trinchera_Statistica.pdf

Examples

## Not run: 
 ## typical example of PLS-PM in customer satisfaction analysis
 ## model with six LVs and reflective indicators
 ## example of rebus analysis with simulated data

 # load data
 data(simdata)

 # Calculate plspm
 sim_inner = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
 dimnames(sim_inner) = list(c("Price", "Quality", "Satisfaction"),
                            c("Price", "Quality", "Satisfaction"))
 sim_outer = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
 sim_mod = c("A", "A", "A")  # reflective indicators
 sim_global = plspm(simdata, sim_inner,
                    sim_outer, modes=sim_mod)
 sim_global

 # run rebus.pls and choose the number of classes
 # to be taken into account according to the displayed dendrogram.
 rebus_sim = rebus.pls(sim_global, stop.crit = 0.005, iter.max = 100)

 # You can also compute complete outputs for local models by running:
 local_rebus = local.models(sim_global, rebus_sim)
 
## End(Not run)
## Not run: 
 ## typical example of PLS-PM in customer satisfaction analysis
 ## model with six LVs and reflective indicators
 ## example of rebus analysis with simulated data

 # load data
 data(simdata)

 # Calculate plspm
 sim_inner = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
 dimnames(sim_inner) = list(c("Price", "Quality", "Satisfaction"),
                            c("Price", "Quality", "Satisfaction"))
 sim_outer = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
 sim_mod = c("A", "A", "A")  # reflective indicators
 sim_global = plspm(simdata, sim_inner,
                    sim_outer, modes=sim_mod)
 sim_global

 # run rebus.pls and choose the number of classes
 # to be taken into account according to the displayed dendrogram.
 rebus_sim = rebus.pls(sim_global, stop.crit = 0.005, iter.max = 100)

 # You can also compute complete outputs for local models by running:
 local_rebus = local.models(sim_global, rebus_sim)
 
## End(Not run)

Permutation Test for REBUS Multi-Group Comparison

Description

Performs permutation tests for comparing pairs of groups from a REBUS object.

Usage

  rebus.test(pls, reb, Y = NULL)
rebus.test(pls, reb, Y = NULL)

Arguments

`pls`	Object of class `"plspm"` returned by `plspm`
`reb`	Object of class `"rebus"` returned by either `rebus.pls` or `it.reb`.
`Y`	Optional dataset (matrix or data frame) used when argument `dataset=NULL` inside `pls`.

Details

A permutation test on path coefficients, loadings, and GoF index is applied to the classes obtained from REBUS, by comparing two classes at a time. That is to say, a permutation test is applied on pair of classes. The number of permutations in each test is 100. In turn, the number of classes handled by rebus.test is limited to 6.

When pls$data=NULL (there is no data matrix), the user must provide the data matrix or data frame in Y.

Value

An object of class "rebus.test", basically a list containing the results of each pair of compared classes. In turn, each element of the list is also a list with the results for the path coefficients, loadings, and GoF index.

Author(s)

Laura Trinchera, Gaston Sanchez

References

Examples

## Not run: 
 ## typical example of PLS-PM in customer satisfaction analysis
 ## model with six LVs and reflective indicators
 ## example of rebus analysis with simulated data

 # load data
 data(simdata)

 # Calculate plspm
 sim_path = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
 dimnames(sim_path) = list(c("Price", "Quality", "Satisfaction"),
                            c("Price", "Quality", "Satisfaction"))
 sim_blocks = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
 sim_mod = c("A", "A", "A")  # reflective indicators
 sim_global = plspm(simdata, sim_path,
                    sim_blocks, modes=sim_mod)
 sim_global

 # Cluster analysis on residuals of global model
 sim_clus = res.clus(sim_global)

 # Iterative steps of REBUS algorithm on 2 classes
 rebus_sim = it.reb(sim_global, sim_clus, nk=2,
                    stop.crit=0.005, iter.max=100)

 # apply rebus.test
 sim_permu = rebus.test(sim_global, rebus_sim)

 # inspect sim.rebus
 sim_permu
 sim_permu$test_1_2

 # or equivalently
 sim_permu[[1]]
 
## End(Not run)
## Not run: 
 ## typical example of PLS-PM in customer satisfaction analysis
 ## model with six LVs and reflective indicators
 ## example of rebus analysis with simulated data

 # load data
 data(simdata)

 # Calculate plspm
 sim_path = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
 dimnames(sim_path) = list(c("Price", "Quality", "Satisfaction"),
                            c("Price", "Quality", "Satisfaction"))
 sim_blocks = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
 sim_mod = c("A", "A", "A")  # reflective indicators
 sim_global = plspm(simdata, sim_path,
                    sim_blocks, modes=sim_mod)
 sim_global

 # Cluster analysis on residuals of global model
 sim_clus = res.clus(sim_global)

 # Iterative steps of REBUS algorithm on 2 classes
 rebus_sim = it.reb(sim_global, sim_clus, nk=2,
                    stop.crit=0.005, iter.max=100)

 # apply rebus.test
 sim_permu = rebus.test(sim_global, rebus_sim)

 # inspect sim.rebus
 sim_permu
 sim_permu$test_1_2

 # or equivalently
 sim_permu[[1]]
 
## End(Not run)

Clustering on communality and structural residuals

Description

Computes communality and structural residuals from a global PLS-PM model and performs a Hierarchical Cluster Analysis on these residuals according to the REBUS algorithm.

Usage

  res.clus(pls, Y = NULL)
res.clus(pls, Y = NULL)

Arguments

`pls`	Object of class `"plspm"`
`Y`	Optional dataset (matrix or data frame) used when argument `dataset=NULL` inside `pls`.

Details

res.clus() comprises the second and third steps of the REBUS-PLS Algorithm. It computes communality and structural residuals. Then it performs a Hierarchical Cluster Analysis on these residuals (step three of REBUS-PLS Algorithm). As a result, this function directly provides a dendrogram obtained from a Hierarchical Cluster Analysis.

Value

An Object of class "hclust" containing the results of the Hierarchical Cluster Analysis on the communality and structural residuals.

Author(s)

Laura Trinchera, Gaston Sanchez

References

Examples

## Not run: 
 ## example of rebus analysis with simulated data

 # load data
 data(simdata)

 # Calculate plspm
 sim_path = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
 dimnames(sim_path) = list(c("Price", "Quality", "Satisfaction"),
                            c("Price", "Quality", "Satisfaction"))
 sim_blocks = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
 sim_modes = c("A", "A", "A")
 sim_global = plspm(simdata, sim_path,
                    sim_blocks, modes=sim_modes)
 sim_global

 # Then compute cluster analysis on the residuals of global model
 sim_clus = res.clus(sim_global)
 
## End(Not run)
## Not run: 
 ## example of rebus analysis with simulated data

 # load data
 data(simdata)

 # Calculate plspm
 sim_path = matrix(c(0,0,0,0,0,0,1,1,0), 3, 3, byrow=TRUE)
 dimnames(sim_path) = list(c("Price", "Quality", "Satisfaction"),
                            c("Price", "Quality", "Satisfaction"))
 sim_blocks = list(c(1,2,3,4,5), c(6,7,8,9,10), c(11,12,13))
 sim_modes = c("A", "A", "A")
 sim_global = plspm(simdata, sim_path,
                    sim_blocks, modes=sim_modes)
 sim_global

 # Then compute cluster analysis on the residuals of global model
 sim_clus = res.clus(sim_global)
 
## End(Not run)

Rescale Latent Variable Scores

Description

Rescale standardized latent variable scores to original scale of manifest variables

Usage

  rescale(pls, data = NULL)
rescale(pls, data = NULL)

Arguments

`pls`	object of class `"plspm"`
`data`	Optional dataset (matrix or data frame) used when argument `dataset=NULL` inside `pls`.

Details

rescale requires all outer weights to be positive

Value

A data frame with the rescaled latent variable scores

Author(s)

Gaston Sanchez

Examples

## Not run: 
 ## example with customer satisfaction analysis

 # load data satisfaction
 data(satisfaction)

 # define inner model matrix
 IMAG = c(0,0,0,0,0,0)
 EXPE = c(1,0,0,0,0,0)
 QUAL = c(0,1,0,0,0,0)
 VAL = c(0,1,1,0,0,0)
 SAT = c(1,1,1,1,0,0)
 LOY = c(1,0,0,0,1,0)
 sat_path = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

 # define outer model list
 sat_blocks = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

 # define vector of reflective modes
 sat_modes = rep("A", 6)

 # apply plspm
 my_pls = plspm(satisfaction, sat_path, sat_blocks, modes = sat_modes,
              scaled=FALSE)

 # rescaling standardized scores of latent variables
 new_scores = rescale(my_pls)

 # compare standardized LVs against rescaled LVs
 summary(my_pls$scores)
 summary(new_scores)
 
## End(Not run)
## Not run: 
 ## example with customer satisfaction analysis

 # load data satisfaction
 data(satisfaction)

 # define inner model matrix
 IMAG = c(0,0,0,0,0,0)
 EXPE = c(1,0,0,0,0,0)
 QUAL = c(0,1,0,0,0,0)
 VAL = c(0,1,1,0,0,0)
 SAT = c(1,1,1,1,0,0)
 LOY = c(1,0,0,0,1,0)
 sat_path = rbind(IMAG, EXPE, QUAL, VAL, SAT, LOY)

 # define outer model list
 sat_blocks = list(1:5, 6:10, 11:15, 16:19, 20:23, 24:27)

 # define vector of reflective modes
 sat_modes = rep("A", 6)

 # apply plspm
 my_pls = plspm(satisfaction, sat_path, sat_blocks, modes = sat_modes,
              scaled=FALSE)

 # rescaling standardized scores of latent variables
 new_scores = rescale(my_pls)

 # compare standardized LVs against rescaled LVs
 summary(my_pls$scores)
 summary(new_scores)
 
## End(Not run)

Dillon-Goldstein's rho

Description

Dillon-Goldstein's rho of a single block of variables

Usage

  rho(X)
rho(X)

Arguments

`X`	matrix representing one block of manifest variables

Value

Dillon-Goldstein's rho

Author(s)

Gaston Sanchez

Examples

## Not run: 
 # load dataset satisfaction
 data(satisfaction)

 # block Image (first 5 columns of satisfaction)
 Image = satisfaction[,1:5]

 # compute Dillon-Goldstein's rho for Image block
 rho(Image)
 
## End(Not run)
## Not run: 
 # load dataset satisfaction
 data(satisfaction)

 # block Image (first 5 columns of satisfaction)
 Image = satisfaction[,1:5]

 # compute Dillon-Goldstein's rho for Image block
 rho(Image)
 
## End(Not run)

Russett A

Description

Russett dataset with variable demo as numeric variable

Format

A data frame with 47 rows and 9 columns

Russett B

Description

Russett dataset with variable demo as factor

Format

A data frame with 47 rows and 9 columns

Russett dataset

Description

Data set from Russett (1964) about agricultural inequality, industrial development and political instability.

Usage

data(russett)data(russett)

Format

A data frame with 47 observations on the following 11 variables. The variables may be used to construct three latent concepts: 1) AGRIN=Agricultural Inequality, 2) INDEV=Industrial Development, 3) POLINS=Political Instability.

Num	Variable	Description	Concept
1	gini	Inequality of land distribution	`AGRIN`
2	farm	Percentage of farmers that own half of the land	`AGRIN`
3	rent	Percentage of farmers that rent all their land	`AGRIN`
4	gnpr	Gross national product per capita	`INDEV`
5	labo	Percentage of labor force employed in agriculture	`INDEV`
6	inst	Instability of executive (1945-1961)	`POLINS`
7	ecks	Number of violent internal war incidents (1941-1961)	`POLINS`
8	death	Number of people killed as a result of civic group violence (1950-1962)	`POLINS`
9	demostab	Political regime: stable democracy	`POLINS`
10	demoinst	Political regime: unstable democracy	`POLINS`
11	dictator	Political regime: dictatorship	`POLINS`

References

Russett B.M. (1964) Inequality and Instability: The Relation of Land Tenure to Politics. World Politics 16:3, pp. 442-454.

Examples

  data(russett)
  russett
data(russett)
  russett

Satisfaction dataset

Description

This data set contains the variables from a customer satisfaction study of a Spanish credit institution on 250 customers.

Usage

satisfactionsatisfaction

Format

A data frame with 250 observations and 28 variables. Variables from 1 to 27 refer to six latent concepts: 1) IMAG=Image, 2) EXPE=Expectations, 3) QUAL=Quality, 4) VAL=Value, 5) SAT=Satisfaction, and 6) LOY=Loyalty. The last variable is a categorical variable indicating the gender of the individual.

IMAG: Includes variables such as reputation, trustworthiness, seriousness, solidness, and caring about customer's needs.
EXPE: Includes variables such as products and services provided, customer service, providing solutions, and expectations for the overall quality.
QUAL: Includes variables such as reliable products and services, range of products and services, personal advice, and overall perceived quality.
VAL: Includes variables such as beneficial services and products, valuable investments, quality relative to price, and price relative to quality.
SAT: Includes variables such as overall rating of satisfaction, fulfillment of expectations, satisfaction relative to other banks, and performance relative to customer's ideal bank.
LOY: Includes variables such as propensity to choose the same bank again, propensity to switch to other bank, intention to recommend the bank to friends, and sense of loyalty.

Source

Laboratory of Information Analysis and Modeling (LIAM). Facultat d'Informatica de Barcelona, Universitat Politecnica de Catalunya.

Examples

  data(satisfaction)
  satisfaction
data(satisfaction)
  satisfaction

Simulated data for REBUS with two groups

Description

Simulated data with two latent classes showing different local models.

Usage

data(simdata)data(simdata)

Format

A data frame of simulated data with 400 observations on the following 14 variables.

mv1: first manifest variable of the block Price Fairness
mv2: second manifest variable of the block Price Fairness
mv3: third manifest variable of the block Price Fairness
mv4: fourth manifest variable of the block Price Fairness
mv5: fifth manifest variable of the block Price Fairness
mv6: first manifest variable of the block Quality
mv7: second manifest variable of the block Quality
mv8: third manifest variable of the block Quality
mv9: fourth manifest variable of the block Quality
mv10: fifth manifest variable of the block Quality
mv11: first manifest variable of the block Customer Satisfaction
mv12: second manifest variable of the block Customer Satisfaction
mv13: third manifest variable of the block Customer Satisfaction
group: a numeric vector

Details

The postulated model overlaps the one used by Jedidi et al. (1997) and by Esposito Vinzi et al. (2007) for their numerical examples. It is composed of one latent endogenous variable, Customer Satisfaction, and two latent exogenous variables, Price Fairness and Quality. Each latent exogenous variable (Price Fairness and Quality) has five manifest variables (reflective mode), and the latent endogenous variable (Customer Satisfaction) is measured by three indicators (reflective mode).

Two latent classes showing different local models are supposed to exist. Each one is composed of 200 units. Thus, the data on the aggregate level for each one of the numerical examples includes 400 units.

The simulation scheme involves working with local models that are different at both the measurement and the structural model levels. In particular, the experimental sets of data consist of two latent classes with the following characteristics:
(a) Class 1 - price fairness seeking customers - characterized by a strong relationship between Price Fairness and Customer Satisfaction (close to 0.9) and a weak relationship between Quality and Customer Satisfaction (close to 0.1), as well as by a weak correlation between the 3rd manifest variable of the Price Fairness block (mv3) and the corresponding latent variable;
(b) Class 2 - quality oriented customers - characterized by a strong relationship between Quality and Customer Satisfaction (close to 0.1) and a weak relationship between Price Fairness and Customer Satisfaction (close to 0.9), as well as by a weak correlation between the 3rd manifest variable (mv8) of the Quality block and the corresponding latent variable.

Source

Simulated data from Trinchera (2007). See References below.

References

Esposito Vinzi, V., Ringle, C., Squillacciotti, S. and Trinchera, L. (2007) Capturing and treating unobserved heterogeneity by response based segmentation in PLS path modeling. A comparison of alternative methods by computational experiments. Working paper, ESSEC Business School.

Jedidi, K., Jagpal, S. and De Sarbo, W. (1997) STEMM: A general finite mixture structural equation model. Journal of Classification 14, pp. 23-50.

Examples

data(simdata)
simdata
data(simdata)
simdata

Spanish football dataset

Description

This data set contains the results of the teams in the Spanish football league 2008-2009.

Usage

spainfootspainfoot

Format

A data frame with 20 observations on 14 variables. The variables may be used to construct four latent concepts: 1) ATTACK=Attack, 2) DEFENSE=Defense, 3) SUCCESS=Success, 4) INDIS=Indiscipline.

Num	Variable	Description	Concept
1	GSH	Goals Scored Home: total number of goals scored at home	`ATTACK`
2	GSA	Goals Scored Away: total number of goals scored away	`ATTACK`
3	SSH	Success to Score Home: Percentage of matches with scores goals at home	`ATTACK`
4	SSA	Success to Score Away: Percentage of matches with scores goals away	`ATTACK`
5	GCH	Goals Conceded Home: total number of goals conceded at home	`DEFENSE`
6	GCA	Goals Conceded Away: total number of goals conceded away	`DEFENSE`
7	CSH	Clean Sheets Home: percentage of matches with no conceded goals at home	`DEFENSE`
8	CSA	Clean Sheets Away: percentage of matches with no conceded goals away	`DEFENSE`
9	WMH	Won Matches Home: total number of won matches at home	`SUCCESS`
10	WMA	Won matches Away: total number of won matches away	`SUCCESS`
11	LWR	Longest Winning Run: longest run of won matches	`SUCCESS`
12	LRWR	Longest Run Without Loss: longest run of matches without losing	`SUCCESS`
13	YC	Yellow Cards: total number of yellow cards	`INDIS`
14	RC	Red Cards: total number of red cards	`INDIS`

Source

League Day. http://www.leagueday.com
Statto. http://www.statto.com
BDFutbol. http://www.statto.com
Cero a cero. http://www.ceroacero.es/

Examples

  data(spainfoot)
  spainfoot
data(spainfoot)
  spainfoot

Technology data set

Description

This data set contains the variables from a "user and acceptance of technology" model on 300 users.

Usage

data(technology)data(technology)

Format

A data frame with 300 observations and 21 variables. Variables can be grouped in six latent concepts: 1) PERF_EXP=Performance Expectancy, 2) EFF_EXP=Effort Expectancy, 3) SUB_NORM=Subjective Norm, 4) FAC_COND=Facilitating Conditions, 5) BEH_INT=Behavioral Intention, and 6) USE_BEH=Use Behavior.

Num	Variable	Description
1	pe1	I find computers useful in my job
2	pe2	Using computers in my job enables me to accomplish tasks more quickly
3	pe3	Using computers in my job increases my productivity
4	pe4	Using computers enhances my effectiveness on the job
5	ee1	My interactions with computers are clear and understandable
6	ee2	It is easy for me to become skillful using computers
7	ee3	I find computers easy to use
8	ee4	Learning to use computers is easy for me
9	sn1	Most people who are important to me think I should use computers
10	sn2	Most people who are important to me would want me to use computers
11	sn3	People whose opinions I value would prefer me to use computers
12	fc1	I have the resources and the knowledge and the ability to make use of the computer
13	fc1	A central support was available to help with computer problems
14	fc1	Management provided most of the necessary help and resources for computing
15	bi1	I predict I will continue to use computers on a regular basis
16	bi2	What are the chances in 100 that you will continue as a computer user?
17	bi3	To do my work, I would use computers rather than any other means available
18	use1	On an average working day, how much time do you spend using computers?
19	use2	On average, how frequently do you use computers?
20	use3	How many different computer applications have you worked with or used in your job?
21	use4	According to your job requirements, indicate each task you use computers to perform?

References

Venkatesh V., Morris M.G., Davis G.B., Davis F.D. (2003) User Acceptance of Information Technology: Toward a Unified View. MIS Quarterly, Vol. 27 (3): 425-478.

Examples

  data(technology)
  summary(technology)
data(technology)
  summary(technology)

Unidimensionality of blocks

Description

Compute unidimensionality indices (a.k.a. Composite Reliability indices)

Usage

  unidim(Data, blocks = NULL)
unidim(Data, blocks = NULL)

Arguments

`Data`	matrix or data frame with variables
`blocks`	optional list with vectors indicating the variables in each block

Value

A data frame with the following columns:

`Block`	name of block
`MVs`	number of manifest variables in each block
`C.alpha`	Cronbach's alpha
`DG.rho`	Dillon-Goldstein rho
`eig.1st`	First eigenvalue
`eig.2nd`	Second eigenvalue

Author(s)

Gaston Sanchez

Examples

## Not run: 
 # load dataset satisfaction
 data(satisfaction)

 # blocks Image and Expectations
 ima_expe = list(Image=1:5, Expec=6:10)

 # compute unidimensionality indices
 unidim(satisfaction, ima_expe)
 
## End(Not run)
## Not run: 
 # load dataset satisfaction
 data(satisfaction)

 # blocks Image and Expectations
 ima_expe = list(Image=1:5, Expec=6:10)

 # compute unidimensionality indices
 unidim(satisfaction, ima_expe)
 
## End(Not run)

Wines dataset

Description

These data are the results of a chemical analysis of wines grown in the same region in Italy but derived from three different cultivars. The analysis determined the quantities of 13 constituents found in each of the three types of wines.

Usage

wineswines

Format

A data frame with 178 observations and 14 variables.

Num	Variable	Description
1	class	Type of wine
2	alcohol	Alcohol
3	malic.acid	Malic acid
4	ash	Ash
5	alcalinity	Alcalinity
6	magnesium	Magnesium
7	phenols	Total phenols
8	flavanoids	Flavanoids
9	nofla.phen	Nonflavanoid phenols
10	proantho	Proanthocyanins
11	col.intens	Color intensity
12	hue	Hue
13	diluted	OD280/OD315 of diluted wines
14	proline	Proline

Source

Machine Learning Repository. http://archive.ics.uci.edu/ml/datasets/Wine

References

Forina, M. et al, PARVUS An Extendible Package for Data Exploration, Classification and Correlation. Institute of Pharmaceutical and Food Analysis and Technologies, Via Brigata Salerno, 16147 Genoa, Italy.

Examples

  data(wines)
  wines
data(wines)
  wines

Package 'plspm'

Help Index

Cronbach's alpha

Description

Usage

Arguments

Value

Author(s)

See Also

Examples

Arizona vegetation dataset

Description

Usage

Format

Source

References

Examples

Cereals datset

Description

Usage

Format

Source

References

Examples

College datasets

Description

Usage

Format

Examples

Futbol dataset from Spain-England-Italy

Description

Usage

Format

Source

Examples

Plot inner model

Description

Usage

Arguments

Note

See Also

Iterative steps of Response-Based Unit Segmentation (REBUS)

Description

Usage

Arguments

Value

Author(s)

References

See Also

Examples

PLS-PM for global and local models

Description

Usage

Arguments

Details

Value

Note

Author(s)

See Also

Examples

ECSI Mobile Phone Provider dataset

Description

Usage

Format

References

Examples

Offense dataset

Description

Usage

Format

Source

Examples

Orange Juice dataset

Description

Usage

Format

Source

References

Examples

Plot outer model