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.
Illustrations of scales whose items do and do not cover the full range of a latent trait as it is found in the population. Circles represent items and the rug plot represents persons. The bottom scale would be sensitive to change only in the highest ranges of the latent trait, whereas the top scale could detect change at any level of the latent trait.
