`install.packages('psych')`

150,960

1.0-97

GPL (>= 2)

May 15th, 2011

iclust

iclust: Item Cluster Analysis -- Hierarchical cluster analysis using psychometric principles

cortest.bartlett

Bartlett's test that a correlation matrix is an identity matrix

ICLUST.rgraph

Draw an ICLUST graph using the Rgraphviz package

factor.residuals

R* = R- F F'

headtail

Combine calls to head and tail

alpha

Find two estimates of reliability: Cronbach's alpha and Guttman's Lambda 6.

bfi

25 Personality items representing 5 factors

affect

Two data sets of affect and arousal scores as a function of personality and movie conditions

geometric.mean

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

VSS.scree

Plot the successive eigen values for a scree test

describe.by

Basic summary statistics by group

circ.tests

Apply four tests of circumplex versus simple structure

msq

75 mood items from the Motivational State Questionnaire for 3896 participants

partial.r

Find the partial correlations for a set (x) of variables with set (y) removed.

cor.plot

Create an image plot for a correlation or factor matrix

cortest.mat

Chi square tests of whether a single matrix is an identity matrix, or a pair of matrices are equal.

ICC

Intraclass Correlations (ICC1, ICC2, ICC3 from Shrout and Fleiss)

factor.rotate

``Hand" rotate a factor loading matrix

SD

Find the Standard deviation for a vector, matrix, or data.frame - do not return error if there are no cases

score.multiple.choice

Score multiple choice items and provide basic test statistics

Dwyer

8 cognitive variables used by Dwyer for an example.

Schmid

12 variables created by Schmid and Leiman to show the Schmid-Leiman Transformation

iclust.diagram

Draw an ICLUST hierarchical cluster structure diagram

interp.median

Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame

reverse.code

Reverse the coding of selected items prior to scale analysis

VSS.parallel

Compare real and random VSS solutions

VSS.plot

Plot VSS fits

fa.sort

Sort factor analysis or principal components analysis loadings

describe

Basic descriptive statistics useful for psychometrics

cities

Distances between 11 US cities

read.clipboard

shortcut for reading from the clipboard

count.pairwise

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

heights

A data.frame of the Galton (1888) height and cubit data set.

00.psych

A package for personality, psychometric, and psychological research

ellipses

Plot data and 1 and 2 sigma correlation ellipses

mat.sort

Sort the elements of a correlation matrix to reflect factor loadings

fa.diagram

Graph factor loading matrices

winsor

Find the Winsorized scores, means, sds or variances for a vector, matrix, or data.frame

scaling.fits

Test the adequacy of simple choice, logistic, or Thurstonian scaling.

income

US family income from US census 2008

fa.extension

Apply Dwyer's factor extension to find factor loadings for extended variables

ICLUST.sort

Sort items by absolute size of cluster loadings

matrix.addition

A function to add two vectors or matrices

cubits

Galton's example of the relationship between height and 'cubit' or forearm length

paired.r

Test the difference between (un)paired correlations

Harman

Two data sets from Harman (1967). 9 cognitive variables from Holzinger and 8 emotional variables from Burt

epi.bfi

13 personality scales from the Eysenck Personality Inventory and Big 5 inventory

biplot.psych

Draw biplots of factor or component scores by factor or component loadings

block.random

Create a block randomized structure for n independent variables

logistic

Logistic transform from x to p and logit transform from p to x

irt.item.diff.rasch

Simple function to estimate item difficulties using IRT concepts

Promax

Perform promax or targeted rotations and return the inter factor angles

Bechtoldt

Seven data sets showing a bifactor solution.

scrub

A utility for basic data cleaning and recoding. Changes values outside of minimum and maximum limits to NA.

fisherz

Fisher r to z and z to r and confidence intervals

table2matrix

Convert a table with counts to a matrix or data.frame representing those counts.

pairs.panels

SPLOM, histograms and correlations for a data matrix

blot

Bond's Logical Operations Test -- BLOT

sim.item

Generate simulated data structures for circumplex or simple structure

cluster2keys

Convert a cluster vector (from e.g., kmeans) to a keys matrix suitable for scoring item clusters.

Gorsuch

Example data set from Gorsuch (1997) for an example factor extension.

draw.tetra

Draw a correlation ellipse and two normal curves to demonstrate tetrachoric correlation

irt.fa

Item Response Analysis by factor analysis of tetrachoric/polychoric correlations

cosinor

Functions for analysis of circadian or diurnal data

structure.diagram

Draw a structural equation model specified by two measurement models and a structural model

burt

11 emotional variables from Burt (1915)

correct.cor

Find dis-attenuated correlations given correlations and reliabilities

test.psych

Testing of functions in the psych package

fa

MinRes (minimum residual) Factor analysis as well as Factor Analysis by Principal Axis, Weighted Least Squares or Maximum Likelihood

diagram

Helper functions for drawing path model diagrams

principal

Principal components analysis

phi

Find the phi coefficient of correlation between two dichotomous variables

omega

Calculate McDonald's omega estimates of general and total factor saturation

cluster.loadings

Find item by cluster correlations, corrected for overlap and reliability

corr.test

Find the correlations, sample sizes, and probability values between elements of a matrix or data.frame.

error.crosses

Plot x and y error bars

factor.fit

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

predict.psych

Prediction function for factor analysis or principal components

guttman

Alternative estimates of test reliabiity

omega.graph

Graph hierarchical factor structures

Yule

From a two by two table, find the Yule coefficients of association, convert to phi, or polychoric, recreate table the table to create the Yule coefficient.

irt.1p

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

score.alpha

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

sim.VSS

create VSS like data

sat.act

3 Measures of ability: SATV, SATQ, ACT

p.rep

Find the probability of replication for an F, t, or r and estimate effect size

cta

Simulate the C(ues) T(endency) A(ction) model of motivation

print.psych

Print and summary functions for the psych class

ICLUST.graph

create control code for ICLUST graphical output

bock

Bock and Liberman (1970) data set of 1000 observations of the LSAT

eigen.loadings

Convert eigen vectors and eigen values to the more normal (for psychologists) component loadings

comorbidity

Convert base rates of two diagnoses and their comorbidity into phi, Yule, and tetrachorics

r.test

Tests of significance for correlations

fa.parallel

Scree plots of data or correlation matrix compared to random ``parallel" matrices

cluster.fit

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

cluster.cor

Find correlations of composite variables from a larger matrix

peas

Galton`s Peas

error.bars.by

Plot means and confidence intervals for multiple groups

factor.congruence

Coefficient of factor congruence

cluster.plot

Plot factor/cluster loadings and assign items to clusters by their highest loading.

factor.model

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

sim.hierarchical

Create a population or sample correlation matrix, perhaps with hierarchical structure.

factor2cluster

Extract cluster definitions from factor loadings

tr

Find the trace of a square matrix

sim.structure

Create correlation matrices or data matrices with a particular measurement and structural model

phi.demo

A simple demonstration of the Pearson, phi, and polychoric corelation

polychor.matrix

Phi or Yule coefficient matrix to polychoric coefficient matrix

sim.anova

Simulate a 3 way balanced ANOVA or linear model, with or without repeated measures.

smc

Find the Squared Multiple Correlation (SMC) of each variable with the remaining variables in a matrix

scatter.hist

Draw a scatter plot with associated X and Y histograms, densitie and correlation

mixed.cor

Find correlations for mixtures of continuous, polytomous, and dichotomous variables

cohen.kappa

Find Cohen's kappa and weighted kappa coefficients for correlation of two raters

mardia

Calculate univariate or multivariate (Mardia's test) skew and kurtosis for a vector, matrix, or data.frame

plot.psych

Plotting functions for the psych package of class ``psych"

score.items

Score item composite scales and find Cronbach's alpha, Guttman lambda 6 and item whole correlations

super.matrix

Form a super matrix from two sub matrices.

tetrachoric

Tetrachoric, polychoric, biserial and polyserial correlations from various types of input

polar

Convert Cartesian factor loadings into polar coordinates

structure.list

Create factor model matrices from an input list

phi2poly

Convert a phi coefficient to a polychoric correlation

sim.congeneric

Simulate a congeneric data set

factor.stats

Find various goodness of fit statistics for factor analysis and principal components

VSS

Apply the Very Simple Structure and MAP criteria to determine the appropriate number of factors.

bi.bars

Draw pairs of bargraphs based on two groups

error.bars

Plot means and confidence intervals

multi.hist

Multiple histograms with density and normal fits on one page

ICLUST.cluster

Function to form hierarchical cluster analysis of items

Tucker

9 Cognitive variables discussed by Tucker and Lewis (1973)

galton

Galton's Mid parent child height data

make.keys

Create a keys matrix for use by score.items or cluster.cor

rescale

Function to convert scores to ``conventional
" metrics

sim

Functions to simulate psychological/psychometric data.

neo

NEO correlation matrix from the NEO_PI_R manual

set.cor

Set Correlation and Multiple Regression from raw or matrix input

iqitems

14 multiple choice IQ items

thurstone

Thurstone Case V scaling

harmonic.mean

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

vegetables

Paired comparison of preferences for 9 vegetables

glb.algebraic

Find the greatest lower bound to reliability.

simulation.circ

Simulations of circumplex and simple structure