eRm: Extended Rasch Modeling
eRm fits Rasch models (RM), linear logistic test models
(LLTM), rating scale model (RSM), linear rating scale models
(LRSM), partial credit models (PCM), and linear partial credit
models (LPCM). Missing values are allowed in the data matrix.
Additional features are the ML estimation of the person
parameters, Andersen's LR-test, item-specific Wald test,
Martin-Loef-Test, nonparametric Monte-Carlo Tests, itemfit and
personfit statistics including infit and outfit measures,
various ICC and related plots, automated stepwise item
elimination, simulation module for various binary data
matrices. An eRm platform is provided at R-forge (see URL).