Sample size determination for logistic regression: A simulation study

Publication Type:
Journal Article
Communications in Statistics: Simulation and Computation, 2015, 44 (2), pp. 360 - 373
Issue Date:
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This article considers the different methods for determining sample sizes for Wald, likelihood ratio, and score tests for logistic regression. We review some recent methods, report the results of a simulation study comparing each of the methods for each of the three types of test, and provide Mathematica code for calculating sample size. We consider a variety of covariate distributions, and find that a calculation method based on a first order expansion of the likelihood ratio test statistic performs consistently well in achieving a target level of power for each of the three types of test. © 2015 Taylor & Francis Group, LLC.
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