Procedures for Psychological, Psychometric, and Personality Research

00.psych-package | A package for personality, psychometric, and psychological... |

alpha | Find two estimates of reliability: Cronbach's alpha and... |

anova.psych | Model comparison for regression, mediation, and factor... |

AUC | Decision Theory measures of specificity, sensitivity, and d... |

bassAckward | The Bass-Ackward factoring algorithm discussed by Goldberg |

best.scales | A bootstrap aggregation function for choosing most predictive... |

bfi | 25 Personality items representing 5 factors |

bi.bars | Draw pairs of bargraphs based on two groups |

bifactor | Seven data sets showing a bifactor solution. |

bigCor | Find large correlation matrices by stitching together smaller... |

biplot.psych | Draw biplots of factor or component scores by factor or... |

block.random | Create a block randomized structure for n independent... |

bock.table | Bock and Liberman (1970) data set of 1000 observations of the... |

cattell | 12 cognitive variables from Cattell (1963) |

circ.tests | Apply four tests of circumplex versus simple structure |

cluster2keys | Convert a cluster vector (from e.g., kmeans) to a keys matrix... |

cluster.cor | Find correlations of composite variables (corrected for... |

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

cluster.loadings | Find item by cluster correlations, corrected for overlap and... |

cluster.plot | Plot factor/cluster loadings and assign items to clusters by... |

cohen.d | Find Cohen d and confidence intervals |

comorbidity | Convert base rates of two diagnoses and their comorbidity... |

congruence | Matrix and profile congruences and distances |

cor2dist | Convert correlations to distances (necessary to do... |

cor.ci | Bootstrapped and normal confidence intervals for raw and... |

corFiml | Find a Full Information Maximum Likelihood (FIML) correlation... |

cor.plot | Create an image plot for a correlation or factor matrix |

correct.cor | Find dis-attenuated correlations given correlations and... |

corr.test | Find the correlations, sample sizes, and probability values... |

cor.smooth | Smooth a non-positive definite correlation matrix to make it... |

cortest.bartlett | Bartlett's test that a correlation matrix is an identity... |

cortest.mat | Chi square tests of whether a single matrix is an identity... |

cor.wt | The sample size weighted correlation may be used in... |

cosinor | Functions for analysis of circadian or diurnal data |

count.pairwise | Count number of pairwise cases for a data set with missing... |

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

densityBy | Create a 'violin plot' or density plot of the distribution of... |

deprecated | Deprecated Exploratory Factor analysis functions. Please use... |

describe | Basic descriptive statistics useful for psychometrics |

describe.by | Basic summary statistics by group |

diagram | Helper functions for drawing path model diagrams |

draw.tetra | Draw a correlation ellipse and two normal curves to... |

dummy.code | Create dummy coded variables |

dwyer | 8 cognitive variables used by Dwyer for an example. |

eigen.loadings | Convert eigen vectors and eigen values to the more normal... |

ellipses | Plot data and 1 and 2 sigma correlation ellipses |

error.bars | Plot means and confidence intervals |

error.bars.by | Plot means and confidence intervals for multiple groups |

error.circles | Two way plots of means, error bars, and sample sizes |

error.crosses | Plot x and y error bars |

error.dots | Show a dot.chart with error bars for different groups or... |

esem | Perform and Exploratory Structural Equation Model (ESEM) by... |

fa | Exploratory Factor analysis using MinRes (minimum residual)... |

faCor | Correlations between two factor analysis solutions |

factor2cluster | Extract cluster definitions from factor loadings |

factor.congruence | Coefficient of factor congruence |

factor.fit | How well does the factor model fit a correlation matrix. Part... |

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... |

factor.stats | Find various goodness of fit statistics for factor analysis... |

fa.diagram | Graph factor loading matrices |

fa.extension | Apply Dwyer's factor extension to find factor loadings for... |

fa.lookup | A set of functions for factorial and empirical scale... |

faMulti | Multi level (hierarchical) factor analysis |

fa.parallel | Scree plots of data or correlation matrix compared to random... |

fa.random | A first approximation to Random Effects Exploratory Factor... |

faRotate | Multiple rotations of factor loadings to find local minima |

fa.sort | Sort factor analysis or principal components analysis... |

fisherz | Transformations of r, d, and t including Fisher r to z and z... |

fparse | Parse and exten formula input from a model and return the DV,... |

Garcia | Data from the sexism (protest) study of Garcia, Schmitt,... |

geometric.mean | Find the geometric mean of a vector or columns of a... |

glb.algebraic | Find the greatest lower bound to reliability. |

Gleser | Example data from Gleser, Cronbach and Rajaratnam (1965) to... |

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

guttman | Alternative estimates of test reliabiity |

Harman | Five data sets from Harman (1967). 9 cognitive variables from... |

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

headtail | Combine calls to head and tail |

ICC | Intraclass Correlations (ICC1, ICC2, ICC3 from Shrout and... |

ICLUST | iclust: Item Cluster Analysis - Hierarchical cluster analysis... |

ICLUST.cluster | Function to form hierarchical cluster analysis of items |

iclust.diagram | Draw an ICLUST hierarchical cluster structure diagram |

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 |

interp.median | Find the interpolated sample median, quartiles, or specific... |

irt.fa | Item Response Analysis by Exploratory Factor Analysis of... |

irt.item.diff.rasch | Simple function to estimate item difficulties using IRT... |

irt.person.rasch | Item Response Theory estimate of theta (ability) using a... |

irt.responses | Plot probability of multiple choice responses as a function... |

kaiser | Apply the Kaiser normalization when rotating factors |

kappa | Find Cohen's kappa and weighted kappa coefficients for... |

KMO | Find the Kaiser, Meyer, Olkin Measure of Sampling Adequacy |

logistic | Logistic transform from x to p and logit transform from p to... |

lowerUpper | Combine two square matrices to have a lower off diagonal for... |

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

manhattan | "Manhattan" plots of correlations with a set of criteria. |

matrix.addition | A function to add two vectors or matrices |

mat.sort | Sort the elements of a correlation matrix to reflect factor... |

mediate | Estimate and display direct and indirect effects of mediators... |

misc | Miscellaneous helper functions for the psych package |

mixed.cor | Find correlations for mixtures of continuous, polytomous, and... |

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... |

omega | Calculate McDonald's omega estimates of general and total... |

omega.graph | Graph hierarchical factor structures |

outlier | Find and graph Mahalanobis squared distances to detect... |

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... |

phi | Find the phi coefficient of correlation between two... |

phi2poly | Convert a phi coefficient to a tetrachoric correlation |

phi.demo | A simple demonstration of the Pearson, phi, and polychoric... |

Pinv | Compute the Moore-Penrose Pseudo Inverse of a matrix |

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... |

predicted.validity | Find the predicted validities of a set of scales based on... |

predict.psych | Prediction function for factor analysis, principal components... |

p.rep | Find the probability of replication for an F, t, or r and... |

principal | Principal components analysis (PCA) |

print.psych | Print and summary functions for the psych class |

Promax | Perform Procustes,bifactor, promax or targeted rotations and... |

range.correction | Correct correlations for restriction of range. (Thorndike... |

reliability | Reports 7 different estimates of scale reliabity including... |

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 |

RMSEA | Root Mean Squared Error of Approximation from chisq, df, and... |

r.test | Tests of significance for correlations |

sat.act | 3 Measures of ability: SATV, SATQ, ACT |

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

scatter.hist | Draw a scatter plot with associated X and Y histograms,... |

schmid | Apply the Schmid Leiman transformation to a correlation... |

Schmid.Leiman | 12 variables created by Schmid and Leiman to show the... |

score.alpha | Score scales and find Cronbach's alpha as well as associated... |

score.irt | Find Item Response Theory (IRT) based scores for dichotomous... |

score.items | Score item composite scales and find Cronbach's alpha,... |

score.multiple.choice | Score multiple choice items and provide basic test statistics |

scoreWtd | Score items using regression or correlation based weights |

scrub | A utility for basic data cleaning and recoding. Changes... |

SD | Find the Standard deviation for a vector, matrix, or... |

set.cor | Multiple Regression and Set Correlation from matrix or raw... |

sim | Functions to simulate psychological/psychometric data. |

sim.anova | Simulate a 3 way balanced ANOVA or linear model, with or... |

sim.congeneric | Simulate a congeneric data set with or without minor factors |

sim.hierarchical | Create a population or sample correlation matrix, perhaps... |

sim.irt | Functions to simulate psychological/psychometric data. |

sim.item | Generate simulated data structures for circumplex, spherical,... |

sim.multilevel | Simulate multilevel data with specified within group and... |

sim.omega | Further functions to simulate psychological/psychometric... |

sim.structural | Create correlation matrices or data matrices with a... |

simulation.circ | Simulations of circumplex and simple structure |

sim.VSS | create VSS like data |

skew | Calculate univariate or multivariate (Mardia's test) skew and... |

smc | Find the Squared Multiple Correlation (SMC) of each variable... |

spider | Make "radar" or "spider" plots. |

statsBy | Find statistics (including correlations) within and between... |

structure.diagram | Draw a structural equation model specified by two measurement... |

structure.list | Create factor model matrices from an input list |

super.matrix | Form a super matrix from two sub matrices. |

table2matrix | Convert a table with counts to a matrix or data.frame... |

tal_or | Data set testing causal direction in presumed media influence |

test.irt | A simple demonstration (and test) of various IRT scoring... |

test.psych | Testing of functions in the psych package |

testRetest | Find various test-retest statistics, including test, person... |

tetrachor | Tetrachoric, polychoric, biserial and polyserial correlations... |

thurstone | Thurstone Case V scaling |

tr | Find the trace of a square matrix |

Tucker | 9 Cognitive variables discussed by Tucker and Lewis (1973) |

unidim | Several indices of the unidimensionality of a set of... |

VSS | Apply the Very Simple Structure, MAP, and other criteria to... |

VSS.parallel | Compare real and random VSS solutions |

VSS.plot | Plot VSS fits |

VSS.scree | Plot the successive eigen values for a scree test |

winsor | Find the Winsorized scores, means, sds or variances for a... |

withinBetween | An example of the distinction between within group and... |

Yule | From a two by two table, find the Yule coefficients of... |

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