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.
Types of Non-response
| Type | Definition | Example |
|---|---|---|
| Unit non-response | No information is collected | Person did not return survey |
| Item non-response | Partial data available | Either part of a scale, such as CESD is missing or the person stopped the interview or testing before the end. |
| Wave non-response | Missing for some waves in a longitudinal study | Person was missing for one or more whole follow-up visits in a longitudinal study. |
