Sample Size Calculator

Study Specification

Set α, power, test settings and design parameters, then calculate

1 - Alpha and hypothesis i

α (alpha)

Hypothesis i

2 - Target Power i

Power (1−β) Target to achieve

3 - Study Design i

Cohen's d

Allocation n₂/n₁

Expected p₁

Comparison p₂

Expected ρ

Null ρ₀

Groups (k)

Effect size f

These values come from your ANOVA results and stay fixed while you adjust targets above. View ANOVA results

Predictors

Expected R²

Using non-central distributions

Updates required n and the power curve.

Results & Power Curve

Run the calculation to see required sample size and power curve

Set parameters above and click Calculate

Power Curve

Run Calculate, then open the chart in a large popup window