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.
Power simulation, moderator distribution 25:75 ratio. The figure shows the power for each of the combination (number of studies in each meta-analysis ranging from 5 to 200 controlled trials; study sample size ranging from 20 to 500 participants; moderator effect ranging from 0 to 0.4; residual heterogeneity ranging from τ2 = 0 to 0.8; for a 25:75 distribution of the moderator (for example, 25% ‘high quality’, 75% ‘low quality’).
