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The Stata Journal
Volume 13 Number 1: pp. 21-38



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Versatile sample-size calculation using simulation

Richard Hooper
Centre for Primary Care and Public Health
Queen Mary, University of London
London, UK
r.l.hooper@qmul.ac.uk
Abstract.  I present a new Stata command, simsam, that uses simulation to determine the sample size required to achieve a given statistical power for any hypothesis test under any probability model that can be programmed in Stata. simsam returns the smallest sample size (or smallest multiple of 5, 10, or some other user-specified increment) so that the estimated power exceeds the target. The user controls the precision of the power estimate, and power is reported with a confidence interval. The sample size returned is reliable to the extent that if simsam is repeated, it will, nearly every time, give a sample size no more than one increment away.
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