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.
Network map of available comparisons. Width of lines is proportional to the number of trials including every pair of treatments (direct comparisons). Size of every circle size is proportional to the total number of randomly assigned participants (i.e., sample size).
