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Dwyer 8 cognitive variables used by Dwyer for an
example.
Gleser Example data from Gleser, Cronbach and
Rajaratnam (1965) to show basic principles of
generalizability theory.
Gorsuch Example data set from Gorsuch (1997) for an
example factor extension.
Harman Five data sets from Harman (1967). 9 cognitive
variables from Holzinger and 8 emotional
variables from Burt
ICC Intraclass Correlations (ICC1, ICC2, ICC3 from
Shrout and Fleiss)
ICLUST.cluster Function to form hierarchical cluster analysis
of items
ICLUST.graph create control code for ICLUST graphical output
ICLUST.rgraph Draw an ICLUST graph using the Rgraphviz
package
ICLUST.sort Sort items by absolute size of cluster loadings
KMO Find the Kaiser, Meyer, Olkin Measure of
Sampling Adequacy
Promax Perform bifactor, promax or targeted rotations
and return the inter factor angles.
SD Find the Standard deviation for a vector,
matrix, or data.frame - do not return error if
there are no cases
Schmid 12 variables created by Schmid and Leiman to
show the Schmid-Leiman Transformation
Schutz The Schutz correlation matrix example from
Shapiro and ten Berge
Tucker 9 Cognitive variables discussed by Tucker and
Lewis (1973)
VSS Apply the Very Simple Structure, MAP, and other
criteria to determine the appropriate number of
factors.
VSS.parallel Compare real and random VSS solutions
VSS.plot Plot VSS fits
VSS.scree Plot the successive eigen values for a scree
test
Yule From a two by two table, find the Yule
coefficients of association, convert to phi, or
tetrachoric, recreate table the table to create
the Yule coefficient.
ability 16 ability items scored as correct or
incorrect.
affect Two data sets of affect and arousal scores as a
function of personality and movie conditions
alpha Find two estimates of reliability: Cronbach's
alpha and Guttman's Lambda 6.
bestScales A set of functions for factorial and empirical
scale construction
bfi 25 Personality items representing 5 factors
bi.bars Draw pairs of bargraphs based on two groups
biplot.psych Draw biplots of factor or component scores by
factor or component loadings
blant A 29 x 29 matrix that produces weird factor
analytic results
block.random Create a block randomized structure for n
independent variables
blot Bond's Logical Operations Test - BLOT
bock Bock and Liberman (1970) data set of 1000
observations of the LSAT
burt 11 emotional variables from Burt (1915)
cattell 12 cognitive variables from Cattell (1963)
circ.tests Apply four tests of circumplex versus simple
structure
cities Distances between 11 US cities
cluster.fit cluster Fit: fit of the cluster model to a
correlation matrix
cluster.loadings Find item by cluster correlations, corrected
for overlap and reliability
cluster.plot Plot factor/cluster loadings and assign items
to clusters by their highest loading.
cluster2keys Convert a cluster vector (from e.g., kmeans) to
a keys matrix suitable for scoring item
clusters.
cohen.d Find Cohen d and confidence intervals
cohen.kappa Find Cohen's kappa and weighted kappa
coefficients for correlation of two raters
comorbidity Convert base rates of two diagnoses and their
comorbidity into phi, Yule, and tetrachorics
cor.ci Bootstrapped confidence intervals for raw and
composite correlations
cor.plot Create an image plot for a correlation or
factor matrix
cor.smooth Smooth a non-positive definite correlation
matrix to make it positive definite
cor.wt The sample size weighted correlation may be
used in correlating aggregated data
cor2dist Convert correlations to distances (necessary to
do multidimensional scaling of correlation
data)
corFiml Find a Full Information Maximum Likelihood
(FIML) correlation or covariance matrix from a
data matrix with missing data
corr.test Find the correlations, sample sizes, and
probability values between elements of a matrix
or data.frame.
correct.cor Find dis-attenuated correlations given
correlations and reliabilities
cortest.bartlett Bartlett's test that a correlation matrix is an
identity matrix
cortest.mat Chi square tests of whether a single matrix is
an identity matrix, or a pair of matrices are
equal.
cosinor Functions for analysis of circadian or diurnal
data
count.pairwise Count number of pairwise cases for a data set
with missing (NA) data.
cta Simulate the C(ues) T(endency) A(ction) model
of motivation
cubits Galton's example of the relationship between
height and 'cubit' or forearm length
cushny A data set from Cushny and Peebles (1905) on
the effect of three drugs on hours of sleep,
used by Student (1908)
densityBy Create a 'violin plot' or density plot of the
distribution of a set of variables
describe Basic descriptive statistics useful for
psychometrics
describeBy Basic summary statistics by group
df2latex Convert a data frame, correlation matrix, or
factor analysis output to a LaTeX table
dfOrder Sort (order) a dataframe or matrix by multiple
columns
diagram Helper functions for drawing path model
diagrams
draw.tetra Draw a correlation ellipse and two normal
curves to demonstrate tetrachoric correlation
dummy.code Create dummy coded variables
eigen.loadings Convert eigen vectors and eigen values to the
more normal (for psychologists) component
loadings
ellipses Plot data and 1 and 2 sigma correlation
ellipses
epi Eysenck Personality Inventory (EPI) data for
3570 participants
epi.bfi 13 personality scales from the Eysenck
Personality Inventory and Big 5 inventory
error.bars Plot means and confidence intervals
error.bars.by Plot means and confidence intervals for
multiple groups
error.crosses Plot x and y error bars
error.dots Show a dot.chart with error bars for different
groups or variables
errorCircles Two way plots of means, error bars, and sample
sizes
esem Perform and Exploratory Structural Equation
Model (ESEM) by using factor extension
techniques
fa Exploratory Factor analysis using MinRes
(minimum residual) as well as EFA by Principal
Axis, Weighted Least Squares or Maximum
Likelihood
fa.diagram Graph factor loading matrices
fa.extension Apply Dwyer's factor extension to find factor
loadings for extended variables
fa.multi Multi level (hierarchical) factor analysis
fa.parallel Scree plots of data or correlation matrix
compared to random "parallel" matrices
fa.poly Deprecated Exploratory Factor analysis
functions. Please use fa
fa.random A first approximation to Random Effects
Exploratory Factor Analysis
fa.sort Sort factor analysis or principal components
analysis loadings
factor.congruence Coefficient of factor congruence
factor.fit How well does the factor model fit a
correlation matrix. Part of the VSS package
factor.model Find R = F F' + U2 is the basic factor model
factor.residuals R* = R- F F'
factor.rotate "Hand" rotate a factor loading matrix
factor.scores Various ways to estimate factor scores for the
factor analysis model
factor.stats Find various goodness of fit statistics for
factor analysis and principal components
factor2cluster Extract cluster definitions from factor
loadings
fisherz Transformations of r, d, and t including Fisher
r to z and z to r and confidence intervals
galton Galton's Mid parent child height data
geometric.mean Find the geometric mean of a vector or columns
of a data.frame.
glb.algebraic Find the greatest lower bound to reliability.
harmonic.mean Find the harmonic mean of a vector, matrix, or
columns of a data.frame
headTail Combine calls to head and tail
heights A data.frame of the Galton (1888) height and
cubit data set.
iclust iclust: Item Cluster Analysis - Hierarchical
cluster analysis using psychometric principles
iclust.diagram Draw an ICLUST hierarchical cluster structure
diagram
income US family income from US census 2008
interp.median Find the interpolated sample median, quartiles,
or specific quantiles for a vector, matrix, or
data frame
iqitems 16 multiple choice IQ items
irt.1p Item Response Theory estimate of theta
(ability) using a Rasch (like) model
irt.fa Item Response Analysis by Exploratory Factor
Analysis of tetrachoric/polychoric correlations
irt.item.diff.rasch Simple function to estimate item difficulties
using IRT concepts
irt.responses Plot probability of multiple choice responses
as a function of a latent trait
kaiser Apply the Kaiser normalization when rotating
factors
logistic Logistic transform from x to p and logit
transform from p to x
lowerUpper Combine two square matrices to have a lower off
diagonal for one, upper off diagonal for the
other
make.keys Create a keys matrix for use by score.items or
cluster.cor
mardia Calculate univariate or multivariate (Mardia's
test) skew and kurtosis for a vector, matrix,
or data.frame
mat.sort Sort the elements of a correlation matrix to
reflect factor loadings
matrix.addition A function to add two vectors or matrices
mediate Estimate and display direct and indirect
effects of mediators and moderator in path
models
mixedCor Find correlations for mixtures of continuous,
polytomous, and dichotomous variables
msq 75 mood items from the Motivational State
Questionnaire for 3896 participants
mssd Find von Neuman's Mean Square of Successive
Differences
multi.hist Multiple histograms with density and normal
fits on one page
multilevel.reliability
Find and plot various
reliability/gneralizability coefficients for
multilevel data
neo NEO correlation matrix from the NEO_PI_R manual
omega Calculate McDonald's omega estimates of general
and total factor saturation
omega.graph Graph hierarchical factor structures
outlier Find and graph Mahalanobis squared distances to
detect outliers
p.rep Find the probability of replication for an F,
t, or r and estimate effect size
paired.r Test the difference between (un)paired
correlations
pairs.panels SPLOM, histograms and correlations for a data
matrix
parcels Find miniscales (parcels) of size 2 or 3 from a
set of items
partial.r Find the partial correlations for a set (x) of
variables with set (y) removed.
peas Galton's Peas
phi Find the phi coefficient of correlation between
two dichotomous variables
phi.demo A simple demonstration of the Pearson, phi, and
polychoric corelation
phi2tetra Convert a phi coefficient to a tetrachoric
correlation
plot.psych Plotting functions for the psych package of
class "psych"
polar Convert Cartesian factor loadings into polar
coordinates
polychor.matrix Phi or Yule coefficient matrix to polychoric
coefficient matrix
predict.psych Prediction function for factor analysis or
principal components
principal Principal components analysis (PCA)
print.psych Print and summary functions for the psych class
psych A package for personality, psychometric, and
psychological research
psych.misc Miscellaneous helper functions for the psych
package
r.test Tests of significance for correlations
rangeCorrection Correct correlations for restriction of range.
(Thorndike Case 2)
read.file Shortcuts for reading from the clipboard or a
file
rescale Function to convert scores to "conventional "
metrics
residuals.psych Extract residuals from various psych objects
reverse.code Reverse the coding of selected items prior to
scale analysis
sat.act 3 Measures of ability: SATV, SATQ, ACT
scaling.fits Test the adequacy of simple choice, logistic,
or Thurstonian scaling.
scatterHist Draw a scatter plot with associated X and Y
histograms, densities and correlation
schmid Apply the Schmid Leiman transformation to a
correlation matrix
score.alpha Score scales and find Cronbach's alpha as well
as associated statistics
score.multiple.choice Score multiple choice items and provide basic
test statistics
scoreIrt Find Item Response Theory (IRT) based scores
for dichotomous or polytomous items
scoreItems Score item composite scales and find Cronbach's
alpha, Guttman lambda 6 and item whole
correlations
scoreOverlap Find correlations of composite variables
(corrected for overlap) from a larger matrix.
scrub A utility for basic data cleaning and recoding.
Changes values outside of minimum and maximum
limits to NA.
setCor Set Correlation and Multiple Regression from
matrix or raw input
sim Functions to simulate
psychological/psychometric data.
sim.VSS create VSS like data
sim.anova Simulate a 3 way balanced ANOVA or linear
model, with or without repeated measures.
sim.congeneric Simulate a congeneric data set
sim.hierarchical Create a population or sample correlation
matrix, perhaps with hierarchical structure.
sim.item Generate simulated data structures for
circumplex, spherical, or simple structure
sim.multilevel Simulate multilevel data with specified within
group and between group correlations
sim.structure Create correlation matrices or data matrices
with a particular measurement and structural
model
simulation.circ Simulations of circumplex and simple structure
smc Find the Squared Multiple Correlation (SMC) of
each variable with the remaining variables in a
matrix
spi A sample from the SAPA Personality Inventory
including an item dictionary and scoring keys.
spider Make "radar" or "spider" plots.
splitHalf Alternative estimates of test reliabiity
statsBy Find statistics (including correlations) within
and between groups for basic multilevel
analyses
structure.diagram Draw a structural equation model specified by
two measurement models and a structural model
structure.list Create factor model matrices from an input list
superMatrix Form a super matrix from two sub matrices.
table2matrix Convert a table with counts to a matrix or
data.frame representing those counts.
test.irt A simple demonstration (and test) of various
IRT scoring algorthims.
test.psych Testing of functions in the psych package
tetrachoric Tetrachoric, polychoric, biserial and
polyserial correlations from various types of
input
thurstone Thurstone Case V scaling
tr Find the trace of a square matrix
unidim Several indices of the unidimensionality of a
set of variables.
vegetables Paired comparison of preferences for 9
vegetables
winsor Find the Winsorized scores, means, sds or
variances for a vector, matrix, or data.frame
withinBetween An example of the distinction between within
group and between group correlations
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