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GNU R package for 'extended Rasch modelling'

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, 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).
Package version:0.14-0-2


Changes in Version 0.14-0

  o new (wrapper) function LLRA for fitting linear logistic
    models with relaxed assumptions including utilities for
    preparing data (llra.datprep), setting up (build_W) and
    modifying (collapse_W) design matrices, comparing llra
    models (anova) and plotting results (plotTR and plotGR)

  o 'exact' version of the Martin-Loef test for binary items and



erm (0.14-0-2) unstable; urgency=low

  * erm: added dependency on r-cran-matrix (Closes: #664609) 

 -- Julian Gilbey <>  Mon, 19 Mar 2012 13:27:09 +0000

erm (0.14-0-1) unstable; urgency=low

  * New upstream release
  * Remove now-obsolete dependency and lintian override for cdbs
  * Update to standards version 3.9.3
  * Convert copyright file to copyright-format 1.0
  * Fix bug i


Upstream-Name: eRm
Upstream-Contact: Reinhold Hatzinger <>
License: GPL-2
Copyright: 2007 Patrick Mair and Reinhold Hatzinger
Comment: The package was renamed from its upstream name 'eRm' to
  'r-cran-erm to fit the pattern of Debian CRA

Browse inside r-cran-erm_0.14-0-2_ia64.deb

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