rasch_model

The logical variable rasch model, which has default value .FALSE., determines whether a 1PL or partial credit model is used. If rasch model is .TRUE., then $a_{dhj} - a_{d(h - 1)j}$ is constant over skills d, categories h, and items j such that skill d in $D(j)$ applies to item j. For a simple case with rasch model equal .TRUE., see listeningr.txt and listeningr.csv.