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.
Estimates and 95% confidence intervals for true item parameters in simulation experiments. SE2: First four items of poset format with DK treated as missing (upper panel); a parameter for binary items (middle panel); b parameter for binary items (lower panel). The dots represent the true parameter value.
