calibrate               Calibrate IRT models per group
dependent_vcov          Item parameter covariance for dependent person
                        samples
detect_dif              Detect differential item functioning
estimate_trend          Estimate a longitudinal IRT trend
irtlink-plots           Plot methods for irtlink objects
link_groups             Linking across groups
linking_design          Inspect the linking design of a data set list
linking_error           Linking error of a linked trend
person_scores           Person parameter estimates for an em
                        calibration
sim_trend_data          Simulate longitudinal item response data
