GMX: Extended Graphical Model Checks for the Rasch Family of Models
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.
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