Sample Size Calculator

Study Specification

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

Configuration

Step 2 - Statistical targets

Set targets (α, power, test setting) in the row below, then Calculate to update required n and the curve.

α (alpha)

Power (1−β) Target to achieve

Hypothesis

Updates required n and the power curve.

Step 3 - Actual study design

Cohen's d

Allocation n₂/n₁

Expected p₁

Comparison p₂

Expected ρ

Null ρ₀

Groups (k)

Effect size f

Nb. participants actual

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

Predictors

Expected R²

Results & Power Curve

Run the calculation to see required sample size and power curve

Output

Set parameters above and click Calculate

Power Curve

Power curve will appear after calculation