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 distribution map for the revised 20-item version of the WIS. The mean of person logits is equal to 0.14 (<1 logit), indicating that the scale item difficulty matches the abilities of the sample. In addition, the floor and ceiling effects were not detected as only 8% (<10%) of the participants were on either end of the spectrum.
