psych: VSS.scree – R documentation

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VSS.scree

Plot the successive eigen values for a scree test

Description

Cattell's scree test is one of most simple ways of testing the number of components or factors in a correlation matrix. Here we plot the eigen values of a correlation matrix as well as the eigen values of a factor analysis.

Usage

scree(rx,factors=TRUE,pc=TRUE,main="Scree plot",hline=NULL,add=FALSE) 
VSS.scree(rx, main = "scree plot")

Arguments

`rx`	a correlation matrix or a data matrix. If data, then correlations are found using pairwise deletions.
`factors`	If true, draw the scree for factors
`pc`	If true, draw the scree for components
`hline`	if null, draw a horizontal line at 1, otherwise draw it at hline (make negative to not draw it)
`main`	Title
`add`	Should multiple plots be drawn?

Details

Among the many ways to choose the optimal number of factors is the scree test. A better function to show the scree as well as compare it to randomly parallel solutions is found found in fa.parallel

Author(s)

William Revelle

References

https://personality-project.org/r/vss.html

Examples

scree(attitude)
#VSS.scree(cor(attitude)

psych

Procedures for Psychological, Psychometric, and Personality Research

v2.1.3

GPL (>= 2)

Authors

William Revelle [aut, cre] (<https://orcid.org/0000-0003-4880-9610>)

Initial release

2021-03-21