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Sample Size Calculator (web)

Two-proportion comparison (paired) [McNemar's test]

Proportion before (p_before):
Proportion after (p_after):
Significance level (α): Two-tailed
Power (1 - β): %
Expected dropout rate: %

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

Formula reference:

Machin, D., Campbell, M. J., Tan, S. B, & Tan, S. H. (2009). Sample size tables for clinical studies (3rd eds.). West Sussex, UK: 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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