About G*Power
G*Power calculates statistical power analyses for a range of statistical tests, including t tests, F tests, chi-squared tests, z tests, and some exact tests. Statistical power analysis helps researchers estimate whether a study design is likely to detect an effect of a given size, or determine the sample size needed for a target analysis. The software can also calculate effect sizes and display analysis results graphically. This supports planning and interpreting research studies before collecting data. The supplied information does not detail assumptions for each test, supported study designs, or export formats. Results depend on the chosen analysis parameters and statistical model. G*Power’s documented purpose is statistical power and effect-size analysis across several test families.
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