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Institut für Medizinische Statistik
Besondere Einrichtung für Medizinische Statistik und Informatik - Medizinische Universität Wien

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Power/Sample Size Calculator

Inference for Proportions: Comparing Two Independent Samples

Choose which calculation you desire, enter the relevant population values (as decimal fractions) for p1 (proportion in population 1) and p2 (proportion in population 2) and, if calculating power, a sample size (assumed the same for each sample). You may also modify alpha and the power, if relevant. After making your entries, hit the calculate button at the bottom.

Calculate Sample Size (for specified Power) Calculate Power (for specified Sample Size)
Enter a value for p1:
Enter a value for p2:
1 Sided Test 2 Sided Test
Enter a value for alpha (default is .05):
Enter a value for desired power (default is .80):
The sample size (for each sample) is:

Comparing  a Mean to a Known Value  Means for Two Independent Samples  a Proportion to a Known Value  Proportions for Two Independent Samples 

Rollin Brant
rollin@health.ucalgary.ca
Reference: The calculations are the customary ones based on the normal approximation to the binomial distribution. See for example, Rosner, B., Fundamentals of Biostatistics (4th ed.), Section 10.7
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