A graphical model check is performed for the multidimensional polytomous Rasch model or the continuous Rating Scale Model.
# S3 method for CRSM
gmc(object, splitcrit = "score", ...)gmc(object, ...)
# S3 method for aLR
gmc(object, ...)
Object of class aLR for graphical model check of the
MPRM or object of class CRSM for graphical model check of the CRSM
Vector or the character vector "score" to define the
split criterion. The default split criterion "score" splits the
sample according to the median of the raw score. Vector can be numeric,
factor or character. (see details)
…
The graphical model check plots the item parameter estimates of two
subsamples to check the homogeneity. This is according to the subsample
split in Andersen's Likelihood Ratio test. For conducting the graphical
model check of the MPRM, at first, a LRT has to be computed
and the resulting object is the input for the gmc function.
For plotting a graphical model check for the CRSM, the model has to be
estimated with CRSM and subsequently the resulting object is
the input for the gmc function. For the CRSM a split criterion has to
be input as vector.
Wright, B.D., and Stone, M.H. (1999). Measurement Essentials. Wilmington: Wide Range Inc.