G*Power
Power analysis and sample size calculation for the standard tests.
Server
G*Power
Universität Düsseldorf · psychologie.hhu.de
- Does
- Power analysis and sample size calculation for the standard tests.
- Access
- Free
Use this when
Before you run the experiment, when it can still change the design. Post-hoc power computed from your observed effect tells you nothing and is a known statistical error.
External tool. We link, we don’t host — nothing you enter on Biology 101 reaches them.
About this tool
Computes required sample size, achieved power or detectable effect size across t-tests, ANOVA, regression, correlation and chi-square.
Science last reviewed .