Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Category characteristic curves (above) and region plot (below) with regions of most probable category responses of an item with five categories. In addition, the locations of RSM and PCM parameters are depicted.
Note. RSM = rating scale model; PCM = partial credit model.
