R Graphical Manual

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Last data update: 2014.03.03

R: Plot a Parallel Analysis Class Object

plotParallel

R Documentation

Plot a Parallel Analysis Class Object

Description

Plot a scree plot adding information about a parallel analysis.

Usage

 plotParallel(parallel,
              eig    = NA,
              x      = eig,
              model  = "components",
              legend = TRUE,
              ylab   = "Eigenvalues",
              xlab   = "Components",
              main   = "Parallel Analysis",
              ...
              )

Arguments

`parallel`	numeric: vector of the results of a previous parallel analysis
`eig`	depreciated parameter: eigenvalues to analyse (not used if x is used, recommended)
`x`	numeric: a `vector` of eigenvalues, a `matrix` of correlations or of covariances or a `data.frame` of data
`model`	character: `"components"` or `"factors"`
`main`	character: title of the plot
`xlab`	character: label of the x axis
`ylab`	character: label of the y axis
`legend`	logical: indicator of the presence or not of a legend
`...`	variable: additionnal parameters to give to the `cor` or `cov` functions

Details

If eig is FALSE the plot shows only the parallel analysis without eigenvalues.

Value

Nothing returned.

Author(s)

Gilles Raiche
Centre sur les Applications des Modeles de Reponses aux Items (CAMRI)
Universite du Quebec a Montreal
raiche.gilles@uqam.ca, http://www.er.uqam.ca/nobel/r17165/

References

Raiche, G., Riopel, M. and Blais, J.-G. (2006). Non graphical solutions for the Cattell's scree test. Paper presented at the International Annual meeting of the Psychometric Society, Montreal. [http://www.er.uqam.ca/nobel/r17165/RECHERCHE/COMMUNICATIONS/]

Examples

## SIMPLE EXAMPLE OF A PARALLEL ANALYSIS
## OF A CORRELATION MATRIX WITH ITS PLOT
 data(dFactors)
 eig      <- dFactors$Raiche$eigenvalues
 subject  <- dFactors$Raiche$nsubjects
 var      <- length(eig)
 rep      <- 100
 cent     <- 0.95
 results  <- parallel(subject,var,rep,cent)

 results


## PARALLEL ANALYSIS SCREE PLOT
 plotParallel(results, x=eig)
 plotParallel(results)