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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 a single Proportion: Comparing to a Known Proportion

Choose which calculation you desire, enter the relevant values (as decimal fractions) for p0 (known value) and p1 (proportion in the population to be sampled) and, if calculating power, a sample size. 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 p0:
Enter a value for p1:
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 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 7.10.3.

 

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