probtrace: Function to calculate probability trace lines
Description
Given an internal mirt object extracted from an estimated model
compute the probability trace lines for all categories.
Usage
probtrace(x, Theta)
Arguments
x
an extracted internal mirt object containing item information (see extract.item)
Theta
a vector (unidimensional) or matrix (unidimensional/multidimensional) of
latent trait values
References
Chalmers, R., P. (2012). mirt: A Multidimensional Item Response Theory
Package for the R Environment. Journal of Statistical Software, 48(6), 1-29.
10.18637/jss.v048.i06