Package: GMX
Type: Package
Title: Extended Graphical Model Checks for the Rasch Family of Models
Version: 0.9-3
Date: 2026-07-20
Authors@R: person(given  = c('Rainer', 'W.'),
                              family = 'Alexandrowicz',
                              role   = c('aut', 'cre'),
                              email  = 'rainer.alexandrowicz@aau.at') 
Description: 
  The function plotLRT() draws pairwise graphical model checks for
      the Rasch Model (RM; Rasch, 1960), 
      the Partial Credit Model (PCM; Masters, 1982), and 
      the Rating Scale Model (RSM; Andrich, 1978)
  using the output object of eRm::LRtest().
  The function cLRT() provides a conditional Likelihood Ratio Test
  (Andersen, 1973), using the routines of 'psychotools' (Zeileis et al., 2026).
  Users may choose to plot
      the threshold parameters, 
      the cumulative thresholds, 
      the average thresholds per item, or
      the person parameters.
  Extended coloring options allow for automated item-wise or
  threshold-wise coloring. For multi-group splits, all pairwise
  group comparisons are drawn automatically.
  The function plotMLT() draws a graphical model check
  for the Martin-Loef-Test (MLT).
  If type='persons', it draws scatterplots of the person parameter 
  estimates of each pair of item sub-groups.
  If type='items', it draws a scatterplot of the item/threshold 
  parameter estimates of each of the two sub-groups vertically 
  against the estimates of the total sample horizontally.
Depends: R (>= 3.0.0)
License: GPL (>= 3)
Imports: psychotools
Suggests: eRm
NeedsCompilation: no
Packaged: 2026-07-20 19:47:48 UTC; aa
Author: Rainer W. Alexandrowicz [aut, cre]
Maintainer: Rainer W. Alexandrowicz <rainer.alexandrowicz@aau.at>
Repository: CRAN
Date/Publication: 2026-07-20 22:30:07 UTC
Built: R 4.5.2; ; 2026-07-21 02:44:16 UTC; unix
