VSS.scree

scree

a correlation matrix or a data matrix. If data, then correlations are found using pairwise deletions.

factors

if null, draw a horizontal line at 1, otherwise draw it at hline (make negative to not draw it)

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main

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.

multivariate

hplot

A general purpose toolbox for personality, psychometrics and experimental psychology.   Functions are primarily for scale construction using factor analysis, principal component analysis, cluster analysis and reliability analysis, although others provide basic descriptive statistics. Item Response Theory is done using  factor analysis of tetrachoric and polychoric correlations. Functions for analyzing data at multi-levels include within and between group statistics, including correlations and factor analysis.   Functions for simulating particular item and test structures are included. Several functions serve as a useful front end for structural equation modeling.  Graphical displays of path diagrams, factor analysis and structural equation models are created using basic graphics. Some of the functions are written to support a book on psychometrics as well as publications in personality research. For more information, see the personality-project.org/r webpage.

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VSS.scree: Plot the successive eigen values for a scree test

Description

Usage

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Examples