Figure 2.
Item response functions (left panel) and locally optimal weights (right panel) for the 4PL, 3PL and 2PL models.
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.