|A package for personality, psychometric, and psychological...
|Find two estimates of reliability: Cronbach's alpha and...
|Model comparison for regression, mediation, and factor...
|Decision Theory measures of specificity, sensitivity, and d...
|The Bass-Ackward factoring algorithm discussed by Goldberg
|A bootstrap aggregation function for choosing most predictive...
|25 Personality items representing 5 factors
|Draw pairs of bargraphs based on two groups
|Seven data sets showing a bifactor solution.
|Find large correlation matrices by stitching together smaller...
|Draw biplots of factor or component scores by factor or...
|Create a block randomized structure for n independent...
|Bock and Liberman (1970) data set of 1000 observations of the...
|12 cognitive variables from Cattell (1963)
|Apply four tests of circumplex versus simple structure
|Convert a cluster vector (from e.g., kmeans) to a keys matrix...
|Find correlations of composite variables (corrected for...
|cluster Fit: fit of the cluster model to a correlation matrix
|Find item by cluster correlations, corrected for overlap and...
|Plot factor/cluster loadings and assign items to clusters by...
|Find Cohen d and confidence intervals
|Convert base rates of two diagnoses and their comorbidity...
|Matrix and profile congruences and distances
|Convert correlations to distances (necessary to do...
|Bootstrapped and normal confidence intervals for raw and...
|Find a Full Information Maximum Likelihood (FIML) correlation...
|Create an image plot for a correlation or factor matrix
|Find dis-attenuated correlations given correlations and...
|Find the correlations, sample sizes, and probability values...
|Smooth a non-positive definite correlation matrix to make it...
|Bartlett's test that a correlation matrix is an identity...
|Chi square tests of whether a single matrix is an identity...
|The sample size weighted correlation may be used in...
|Functions for analysis of circadian or diurnal data
|Count number of pairwise cases for a data set with missing...
|Simulate the C(ues) T(endency) A(ction) model of motivation
|Create a 'violin plot' or density plot of the distribution of...
|Deprecated Exploratory Factor analysis functions. Please use...
|Basic descriptive statistics useful for psychometrics
|Basic summary statistics by group
|Helper functions for drawing path model diagrams
|Draw a correlation ellipse and two normal curves to...
|Create dummy coded variables
|8 cognitive variables used by Dwyer for an example.
|Convert eigen vectors and eigen values to the more normal...
|Plot data and 1 and 2 sigma correlation ellipses
|Plot means and confidence intervals
|Plot means and confidence intervals for multiple groups
|Two way plots of means, error bars, and sample sizes
|Plot x and y error bars
|Show a dot.chart with error bars for different groups or...
|Perform and Exploratory Structural Equation Model (ESEM) by...
|Exploratory Factor analysis using MinRes (minimum residual)...
|Correlations between two factor analysis solutions
|Extract cluster definitions from factor loadings
|Coefficient of factor congruence
|How well does the factor model fit a correlation matrix. Part...
|Find R = F F' + U2 is the basic factor model
|R* = R- F F'
|"Hand" rotate a factor loading matrix
|Various ways to estimate factor scores for the factor...
|Find various goodness of fit statistics for factor analysis...
|Graph factor loading matrices
|Apply Dwyer's factor extension to find factor loadings for...
|A set of functions for factorial and empirical scale...
|Multi level (hierarchical) factor analysis
|Scree plots of data or correlation matrix compared to random...
|A first approximation to Random Effects Exploratory Factor...
|Multiple rotations of factor loadings to find local minima
|Sort factor analysis or principal components analysis...
|Transformations of r, d, and t including Fisher r to z and z...
|Parse and exten formula input from a model and return the DV,...
|Data from the sexism (protest) study of Garcia, Schmitt,...
|Find the geometric mean of a vector or columns of a...
|Find the greatest lower bound to reliability.
|Example data from Gleser, Cronbach and Rajaratnam (1965) to...
|Example data set from Gorsuch (1997) for an example factor...
|Alternative estimates of test reliabiity
|Five data sets from Harman (1967). 9 cognitive variables from...
|Find the harmonic mean of a vector, matrix, or columns of a...
|Combine calls to head and tail
|Intraclass Correlations (ICC1, ICC2, ICC3 from Shrout and...
|iclust: Item Cluster Analysis - Hierarchical cluster analysis...
|Function to form hierarchical cluster analysis of items
|Draw an ICLUST hierarchical cluster structure diagram
|create control code for ICLUST graphical output
|Draw an ICLUST graph using the Rgraphviz package
|Sort items by absolute size of cluster loadings
|Find the interpolated sample median, quartiles, or specific...
|Item Response Analysis by Exploratory Factor Analysis of...
|Simple function to estimate item difficulties using IRT...
|Item Response Theory estimate of theta (ability) using a...
|Plot probability of multiple choice responses as a function...
|Apply the Kaiser normalization when rotating factors
|Find Cohen's kappa and weighted kappa coefficients for...
|Find the Kaiser, Meyer, Olkin Measure of Sampling Adequacy
|Logistic transform from x to p and logit transform from p to...
|Combine two square matrices to have a lower off diagonal for...
|Create a keys matrix for use by score.items or cluster.cor
|"Manhattan" plots of correlations with a set of criteria.
|A function to add two vectors or matrices
|Sort the elements of a correlation matrix to reflect factor...
|Estimate and display direct and indirect effects of mediators...
|Miscellaneous helper functions for the psych package
|Find correlations for mixtures of continuous, polytomous, and...
|Find von Neuman's Mean Square of Successive Differences
|Multiple histograms with density and normal fits on one page
|Find and plot various reliability/gneralizability...
|Calculate McDonald's omega estimates of general and total...
|Graph hierarchical factor structures
|Find and graph Mahalanobis squared distances to detect...
|Test the difference between (un)paired correlations
|SPLOM, histograms and correlations for a data matrix
|Find miniscales (parcels) of size 2 or 3 from a set of items
|Find the partial correlations for a set (x) of variables with...
|Find the phi coefficient of correlation between two...
|Convert a phi coefficient to a tetrachoric correlation
|A simple demonstration of the Pearson, phi, and polychoric...
|Compute the Moore-Penrose Pseudo Inverse of a matrix
|Plotting functions for the psych package of class "psych"
|Convert Cartesian factor loadings into polar coordinates
|Phi or Yule coefficient matrix to polychoric coefficient...
|Find the predicted validities of a set of scales based on...
|Prediction function for factor analysis, principal components...
|Find the probability of replication for an F, t, or r and...
|Principal components analysis (PCA)
|Print and summary functions for the psych class
|Perform Procustes,bifactor, promax or targeted rotations and...
|Correct correlations for restriction of range. (Thorndike...
|Reports 7 different estimates of scale reliabity including...
|Function to convert scores to "conventional " metrics
|Extract residuals from various psych objects
|Reverse the coding of selected items prior to scale analysis
|Root Mean Squared Error of Approximation from chisq, df, and...
|Tests of significance for correlations
|3 Measures of ability: SATV, SATQ, ACT
|Test the adequacy of simple choice, logistic, or Thurstonian...
|Draw a scatter plot with associated X and Y histograms,...
|Apply the Schmid Leiman transformation to a correlation...
|12 variables created by Schmid and Leiman to show the...
|Score scales and find Cronbach's alpha as well as associated...
|Find Item Response Theory (IRT) based scores for dichotomous...
|Score item composite scales and find Cronbach's alpha,...
|Score multiple choice items and provide basic test statistics
|Score items using regression or correlation based weights
|A utility for basic data cleaning and recoding. Changes...
|Find the Standard deviation for a vector, matrix, or...
|Multiple Regression and Set Correlation from matrix or raw...
|Functions to simulate psychological/psychometric data.
|Simulate a 3 way balanced ANOVA or linear model, with or...
|Simulate a congeneric data set with or without minor factors
|Create a population or sample correlation matrix, perhaps...
|Functions to simulate psychological/psychometric data.
|Generate simulated data structures for circumplex, spherical,...
|Simulate multilevel data with specified within group and...
|Further functions to simulate psychological/psychometric...
|Create correlation matrices or data matrices with a...
|Simulations of circumplex and simple structure
|create VSS like data
|Calculate univariate or multivariate (Mardia's test) skew and...
|Find the Squared Multiple Correlation (SMC) of each variable...
|Make "radar" or "spider" plots.
|Find statistics (including correlations) within and between...
|Draw a structural equation model specified by two measurement...
|Create factor model matrices from an input list
|Form a super matrix from two sub matrices.
|Convert a table with counts to a matrix or data.frame...
|Data set testing causal direction in presumed media influence
|A simple demonstration (and test) of various IRT scoring...
|Testing of functions in the psych package
|Find various test-retest statistics, including test, person...
|Tetrachoric, polychoric, biserial and polyserial correlations...
|Thurstone Case V scaling
|Find the trace of a square matrix
|9 Cognitive variables discussed by Tucker and Lewis (1973)
|Several indices of the unidimensionality of a set of...
|Apply the Very Simple Structure, MAP, and other criteria to...
|Compare real and random VSS solutions
|Plot VSS fits
|Plot the successive eigen values for a scree test
|Find the Winsorized scores, means, sds or variances for a...
|An example of the distinction between within group and...
|From a two by two table, find the Yule coefficients of...
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