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psych (version 1.0-74)

Procedures for Psychological, Psychometric, and Personality Research

Description

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. Functions for simulating particular item and test structures are included. Several functions serve as a useful front end for structural equation modeling. For more information, see the personality-project.org/r webpage.

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Version

Install

install.packages('psych')

Monthly Downloads

240,452

Version

1.0-74

License

GPL (>= 2)

Maintainer

William Revelle

Last Published

June 26th, 2009

Functions in psych (1.0-74)

ICLUST.cluster

Function to form hierarchical cluster analysis of items
ICLUST.rgraph

Draw an ICLUST graph using the Rgraphviz package
fa

Factor analysis by Principal Axis, MinRes (minimum residual), Weighted Least Squares or Maximum Likelihood
score.multiple.choice

Score multiple choice items and provide basic test statistics
ICLUST.sort

Sort items by absolute size of cluster loadings
ICC

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

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

Galton`s Peas
omega.graph

Graph hierarchical factor structures
ICLUST

ICLUST: Item Cluster Analysis -- Hierarchical cluster analysis using psychometric principles
bfi

25 Personality items representing 5 factors
bifactor

Seven data sets showing a bifactor solution.
SD

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

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

14 multiple choice IQ items
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.
cluster.fit

cluster Fit: fit of the cluster model to a correlation matrix
factor.congruence

Coefficient of factor congruence
ellipses

Plot data and 1 and 2 sigma correlation ellipses
plot.psych

Plotting functions for the psych package of class ``psych"
make.keys

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

Tests of significance for correlations
phi2poly

Convert a phi coefficient to a polychoric correlation
headtail

Combine calls to head and tail
VSS.parallel

Compare real and random VSS solutions
p.rep

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

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

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

Apply four tests of circumplex versus simple structure
fa.parallel

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

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

Distances between 11 US cities
sim.VSS

create VSS like data
factor.stats

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

Find correlations of composite variables from a larger matrix
Promax

Perform promax or targeted rotations and return the inter factor angles
error.bars.by

Plot means and confidence intervals for multiple groups
cubits

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

Plot means and confidence intervals
describe.by

Basic summary statistics by group
alpha

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

Find item by cluster correlations, corrected for overlap and reliability
matrix.addition

A function to add two vectors or matrices
fa.graph

Graph factor loading matrices
corr.test

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

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

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

Plot x and y error bars
VSS.scree

Plot a scree test
cortest.mat

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

Find dis-attenuated correlations given correlations and reliabilities
00.psych

A package for personality, psychometric, and psychological research
simulation.circ

Simulations of circumplex and simple structure
epi.bfi

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

Alternative estimates of test reliabiity
polar

Convert Cartesian factor loadings into polar coordinates
ICLUST.graph

create control code for ICLUST graphical output
phi.demo

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

75 mood items from the Motivational State Questionnaire for 3896 participants
factor.model

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

Create an image plot for a correlation or factor matrix
describe

Basic descriptive statistics useful for psychometrics
multi.hist

Multiple histograms with density and normal fits on one page
sim.item

Generate simulated data structures for circumplex or simple structure
factor.residuals

R* = R- F F'
sim.congeneric

Simulate a congeneric data set
count.pairwise

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

Fisher r to z and z to r and confidence intervals
galton

Galton's Mid parent child height data
harmonic.mean

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

Sort the elements of a correlation matrix to reflect factor loadings
cluster2keys

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

``Hand" rotate a factor loading matrix
schmid

Apply the Schmid Leiman transformation to a correlation matrix
sat.act

3 Measures of ability: SATV, SATQ, ACT
cosinor

Functions for analysis of circadian or diurnal data
VSS.plot

Plot VSS fits
cta

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

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

NEO correlation matrix from the NEO_PI_R manual
polychor.matrix

Phi or Yule coefficient matrix to polychoric coefficient matrix
poly.mat

Find polychoric correlations of item data
print.psych

Print and summary functions for the psych class
rescale

Function to convert scores to ``conventional " metrics
omega

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

Find the geometric mean of a vector or columns of a data.frame.
irt.1p

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

Multiple Regression from matrix input
structure.graph

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

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

Test the difference between (un)paired correlations
heights

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

SPLOM, histograms and correlations for a data matrix
phi

Find the phi coefficient of correlation between two dichotomous variables
partial.r

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

Functions to simulate psychological/psychometric data.
interp.median

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

Create a population or sample correlation matrix, perhaps with hierarchical structure.
factor2cluster

Extract cluster definitions from factor loadings
sim.anova

Simulate a 3 way balanced ANOVA or linear model, with or without repeated measures.
irt.item.diff.rasch

Simple function to estimate item difficulties using IRT concepts
test.psych

Testing of functions in the psych package
principal

Principal components analysis
score.alpha

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

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

shortcut for reading from the clipboard
skew

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

Paired comparison of preferences for 9 vegetables
super.matrix

Form a super matrix from two sub matrices.
tr

Find the trace of a square matrix
thurstone

Thurstone Case V scaling
smc

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

Create factor model matrices from an input list
winsor

Find the Winsorized scores or means for a vector, matrix, or data.frame
table2matrix

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