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GMX  

Extended Graphical Model Checks for the Rasch Family of Models
View on CRAN: Click here


Download and install GMX package within the R console
Install from CRAN:
install.packages("GMX")

Install from Github:
library("remotes")
install_github("cran/GMX")

Install by package version:
library("remotes")
install_version("GMX", "0.9-2")



Attach the package and use:
library("GMX")
Maintained by
Rainer W. Alexandrowicz
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2026-03-10
Latest Update: 2026-03-10
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'. 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. For more details see Andersen (1973) <doi:10.1007/BF02291180>, Andrich (1978) <doi:10.1007/BF02293814>, Masters (1982) <doi:10.1007/BF02296272> and Rasch (1960, ISBN:9780598554512).
How to cite:
Rainer W. Alexandrowicz (2026). GMX: Extended Graphical Model Checks for the Rasch Family of Models. R package version 0.9-2, https://cran.r-project.org/web/packages/GMX. Accessed 07 Jun. 2026.
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