Interim Analysis Sample Size CalculationadminApril 28, 2026Calculators Interim Analysis Sample Size Calculator Significance Level (α): 0.05 0.01 Power (1 – β): 0.8 0.9 Effect Size: Ratio: 1:1 2:1 3:1 Calculate For more information, refer to these authoritative sources: FDA Guidance on Sample Size Determination CDC Sample Size Calculator
