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psych (version 1.0-67)

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

242,751

Version

1.0-67

License

GPL (>= 2)

Maintainer

William Revelle

Last Published

March 27th, 2009

Functions in psych (1.0-67)

sim.congeneric

Simulate a congeneric data set
Promax

Perform promax rotation and return the inter factor angles
ICLUST.cluster

Function to form hierarchical cluster analysis of items
ICLUST.sort

Sort items by absolute size of cluster loadings
polar

Convert Cartesian factor loadings into polar coordinates
VSS.parallel

Compare real and random VSS solutions
error.crosses

Plot x and y error bars
VSS.plot

Plot VSS fits
cortest.bartlett

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

Six data sets showing a bifactor solution.
wkappa

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

Print and summary functions for the psych class
iqitems

14 multiple choice IQ items
cluster2keys

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

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

Multiple Regression from matrix input
phi2poly

Convert a phi coefficient to a polychoric correlation
ellipses

Plot data and 1 and 2 sigma correlation ellipses
describe

Basic descriptive statistics useful for psychometrics
factor.rotate

``Hand" rotate a factor loading matrix
plot.psych

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

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

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

A function to add two vectors or matrices
headtail

Combine calls to head and tail
describe.by

Basic summary statistics by group
schmid

Apply the Schmid Leiman transformation to a correlation matrix
principal

Principal components analysis
multi.hist

Multiple histograms with density and normal fits on one page
fisherz

Fisher r to z and z to r and confidence intervals
fa.graph

Graph factor loading matrices
ICLUST.graph

create control code for ICLUST graphical output
cluster.fit

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

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

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

Test the difference between (un)paired correlations
galton

Galton's Mid parent child height data
irt.1p

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

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

Principal Axis Factor Analysis
cortest.mat

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

Plot a scree test
cubits

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

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

Find dis-attenuated correlations given correlations and reliabilities
cosinor

Functions for analysis of circadian or diurnal data
epi.bfi

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

Create demo data for psychometrics
factor2cluster

Extract cluster definitions from factor loadings
cities

Distances between 11 US cities
phi

Find the phi coefficient of correlation between two dichotomous variables
poly.mat

Find polychoric correlations of item data
ICC

Intraclass Correlations (ICC1, ICC2, ICC3 from Shrout and Fleiss)
error.bars.by

Plot means and confidence intervals for multiple groups
SD

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

Alternative estimates of test reliabiity
alpha

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

R* = R- F F'
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.
factor.fit

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

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

Find item by cluster correlations, corrected for overlap and reliability
circ.tests

Apply four tests of circumplex versus simple structure
corr.test

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

SPLOM, histograms and correlations for a data matrix
ICLUST

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

25 Personality items representing 5 factors
factor.congruence

Coefficient of factor congruence
fa.parallel

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

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

Tests of significance for correlations
p.rep

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

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

Find correlations of composite variables from a larger matrix
psych

A package for personality, psychometric, and psychological research
error.bars

Plot means and confidence intervals
make.keys

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

Draw an ICLUST graph using the Rgraphviz package
sat.act

3 Measures of ability: SATV, SATQ, ACT
peas

Galton`s Peas
polychor.matrix

Phi or Yule coefficient matrix to polychoric coefficient matrix
eigen.loadings

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

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

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

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

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

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

Graph hierarchical factor structures
irt.item.diff.rasch

Simple function to estimate item difficulties using IRT concepts
simulation.circ

Simulations of circumplex and simple structure
partial.r

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

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

Function to convert scores to ``conventional " metrics
sim

Functions to simulate psychological/psychometric data.
tr

Find the trace of a square matrix
vegetables

Paired comparison of preferences for 9 vegetables
thurstone

Thurstone Case V scaling
smc

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

shortcut for reading from the clipboard
sim.structure

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

Form a super matrix from two sub matrices.
sim.item

Generate simulated data structures for circumplex or simple structure
structure.graph

Draw a structural equation model specified by two measurement models and a structural model
test.psych

Testing of functions in the psych package
table2matrix

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

Create factor model matrices from an input list
winsor

Find the Winsorized scores or means for a vector, matrix, or data.frame
score.multiple.choice

Score multiple choice items and provide basic test statistics
sim.VSS

create VSS like data