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.
Person–item threshold distribution for Summary scale. This figure displays the person–item threshold distribution for the Summary scale. The normal distribution of bars above the x-axis that fall within the range of the items (below the x-axis).
