`install.packages('psych')`

150,960

1.0-17

GPL version 2 or newer

May 5th, 2007

correct.cor

Find dis-attenuated correlations and give alpha reliabilities

fisherz

Fisher z transform of r

factor.fit

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

principal

Principal components analysis

circ.sim

Generate simulated data structures for circumplex or simple structure

omega

Calculate the omega estimate of factor saturation

count.pairwise

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

VSS.simulate

create VSS like data

ICLUST.sort

sort items by absolute size of cluster loadins

ICLUST.cluster

Function to form hierarchical cluster analysis of items

describe.by

Basic summary statistics by group

factor.model

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

multi.hist

Multiple histograms on one screen

cluster.cor

Find correlations of composite variables from a larger matrix

VSS.scree

Plot a scree test

VSS.parallel

Compare real and random VSS solutions

VSS.plot

Plot VSS fits

ICLUST

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

psycho.demo

Create demo data for psychometrics

irt.1p

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

schmid

Apply the Schmid Leiman transformation to a correlation matrix

score.items

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

VSS

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

pairs.panels

SPLOM, histograms and correlations for a data matrix

cluster.fit

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

score.alpha

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

phi

Find the phi coefficient of correlation between two dichotomous variables

alpha.scale

Cronbach alpha for a scale

matrix.addition

A function to add two vectors or matrices

circ.tests

Apply four tests of circumplex versus simple structure

ICLUST.graph

create control code for ICLUST graphical output

eigen.loadings

Extract eigen vectors, eigen values, show loadings

factor.residuals

R* = R- F F'

describe

Basic descriptive statistics useful for psychometrics

read.clipboard

shortcut for reading from the clipboard

mat.regress

Multiple Regression from matrix input

factor.pa

Principal Axis Factor Analysis

geometric.mean

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

paired.r

Test the difference between paired correlations

factor.rotate

"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

phi2poly

Convert a phi coefficient to a polychoric correlation

factor2cluster

Extract cluster definitions from factor loadings

skew

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

error.crosses

Plot x and y error bars

harmonic.mean

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