Power analysis calculator

Sample size and power calculator

Estimate power or required sample size for common t-tests, correlations, proportions, ANOVA, regression, and survival designs.

Run this test in StatLab Use @statlab/core

When to use it

Use before data collection or when documenting detectable effect sizes.

Inputs

  • Effect size
  • Alpha
  • Target power
  • Design family

Reporting cautions

  • Power is only as good as the effect-size assumption.
  • Pre-register assumptions when feasible.

Technical teams

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