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.
Survey response rate by number of months since website registration. (Slopes on the plot show fit line from linear regression of aggregated proportions by number of months, provided as a visual aid. Significance testing conducted with person-level logistic regression, reported in the text.)
