poly2dich: Change polytomous items to dichotomous item format
Description
Transforms a matrix of items into a new matrix where the select polytomous items have been
converted into comparable dichotomous items with the same information.
Chalmers, R., P. (2012). mirt: A Multidimensional Item Response Theory
Package for the R Environment. Journal of Statistical Software, 48(6), 1-29.
tools:::Rd_expr_doi("10.18637/jss.v048.i06")