Figure 1:
Kernel densities of the estimated probabilities of trial participation (left panel) for randomized (solid line) and non-randomized (dashed line) individuals and estimated weights (right panel) for randomized individuals.
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.