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 LRtest, itemspecific Wald test, MartinLoefTest, nonparametric MonteCarlo 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.
Package details 


Author  Patrick Mair [cre, aut], Reinhold Hatzinger [aut], Marco J. Maier [aut], Thomas Rusch [ctb] 
Date of publication  20180311 08:16:03 UTC 
Maintainer  Patrick Mair <[email protected]> 
License  GPL2 
Version  0.160 
URL  http://rforge.rproject.org/projects/erm/ 
Package repository  View on CRAN 
Installation 
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