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Sample Size Calculator (web)

2 proportions - Hypothesis Testing

Proportion in control (p₀):
Proportion in case (p₁):
Significance level (α): Two-tailed
Power (1 - β): %
Expected dropout rate: %

Sample size, n per group =
Sample size (with 10% dropout), n_drop per group =

Formula reference:

Lemeshow, S., Hosmer Jr, D. W., Klar, J., Lwanga, S. K. (1990). Adequacy of sample size in health studies. England: John Wiley & Sons Ltd.

Suggested reference:

APA: Arifin, W. N. (). Sample size calculator (web). Retrieved from http://wnarifin.github.io

Vancouver: Arifin WN. Sample size calculator (web) [Internet]. [cited ]. Available from: http://wnarifin.github.io

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