cor2dist

If square, then assumed to be a correlation matrix, otherwise the correlations are found first.

A minor helper function to convert correlations (ranging from -1 to 1) to distances (ranging from 0 to 2). $d = \sqrt(2(1-r))$.

multivariate

models

A number of routines for personality, psychometrics and experimental psychology.   Functions are primarily for scale construction using factor 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 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.

cor2dist: Convert correlations to distances (necessary to do multidimensional scaling of correlation data)

Description

Usage

Arguments

Value

References