Fig. 2.
IRTPRO screen shots for graded response model and differential item functioning. a introductory screen. b first part of sequence to enable DIF detection c second part of sequence to enable DIF d DIF Output
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.