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psych (version 1.0-17)

Procedures for Personality and Psychological Research

Description

A number of routines for personality, psychometrics and experimental psychology, Functions are primarily for scale construction and reliability analysis, although others are basic descriptive stats, For more information, see the personality-project.org/r

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Install

install.packages('psych')

Monthly Downloads

150,960

Version

1.0-17

License

GPL version 2 or newer

Maintainer

William Revelle

Last Published

May 5th, 2007

Functions in psych (1.0-17)

Find dis-attenuated correlations and give alpha reliabilities

Fisher z transform of r

How well does the factor model fit a correlation matrix. Part of the VSS package

Principal components analysis

Generate simulated data structures for circumplex or simple structure

Calculate the omega estimate of factor saturation

Count number of pairwise cases for a data set with missing (NA) data.

create VSS like data

sort items by absolute size of cluster loadins

Function to form hierarchical cluster analysis of items

Basic summary statistics by group

Find R = F F' + U2 is the basic factor model

polychor.matrix

Actually, what does this do? Convert a matrix of phi coefficients to a matrix of polycoric correlations

circ.simulation

Simulations of circumplex and simple structure

Multiple histograms on one screen

Find correlations of composite variables from a larger matrix

Plot a scree test

Compare real and random VSS solutions

ICLUST: Item Cluster Analysis -- Hierarchical cluster analysis using psychometric principals

Create demo data for psychometrics

Item Response Theory estimate of theta (ability) using a Rasch (like) model

Apply the Schmid Leiman transformation to a correlation matrix

Score item composite scales and find Cronbach's alpha as well as associated statistics

Apply the Very Simple Structure criterion to determine the appropriate number of factors.

SPLOM, histograms and correlations for a data matrix

cluster Fit: fit of the cluster model to a correlation matrix

Score scales and find Cronbach's alpha as well as associated statistics

irt.item.diff.rasch

Simple function to estimate item difficulties using IRT concepts

factor.congruence

Coefficient of factor congruence

00psych-package

A package for personality, psychometric, and psychological research

Find the phi coefficient of correlation between two dichotomous variables

Cronbach alpha for a scale

matrix.addition

A function to add two vectors or matrices

Apply four tests of circumplex versus simple structure

create control code for ICLUST graphical output

Extract eigen vectors, eigen values, show loadings

factor.residuals

Basic descriptive statistics useful for psychometrics

shortcut for reading from the clipboard

Multiple Regression from matrix input

Principal Axis Factor Analysis

Find the geometric mean of a vector or columns of a data.frame.

Test the difference between paired correlations

"Hand" rotate a factor loading matrix

make.hierarchical

Create a population or sample correlation matrix with hierachical structure.

cluster.loadings

Find item by cluster correlations, corrected for overlap and reliability

Convert a phi coefficient to a polychoric correlation

Extract cluster definitions from factor loadings

Calculate skew for a vector, matrix, or data.frame

Plot x and y error bars

Find the harmonic mean of a vector, matrix, or columns of a data.frame