Anxiety                 A Measure of Anxiety
DFIT                    calculates DFIT statistics
calcprob                calculates item response probabilities
calctheta               calculates EAP theta estimates and associated
                        standard errors
collapse                collapses response categories
equate                  performs Stocking-Lord Equating
extract                 extracts IRT item parameters
getcutoff               determines a cutoff threshold
lordif                  performs Logistic Ordinal Regression
                        Differential Item Functioning using IRT
lordif-package          Logistic Ordinal Regression Differential Item
                        Functioning using IRT
montecarlo              performs Monte Carlo simulations to generate
                        empirical distributions
permute                 performs permutation test for empirical cutoff
                        thresholds
plot.lordif             Plot method for lordif class
plot.lordif.MC          Plot method for Monte Carlo simulation output
probgpcm                calculates item response probabilities
                        according to GPCM
probgrm                 calculates item response probabilities
                        according to GRM
recode                  recodes item responses
rundif                  runs ordinal logistic regression DIF
runolr                  runs ordinal logistic regression models
separate                splits item response vectors of DIF items by
                        group
tcc                     computes a test characteristic curve (tcc)
