Empirical Power and Sample Size Calculations for Cluster-Randomized and Cluster-Randomized Crossover Studies

• Nicholas G. Reich ,

  * E-mail: nick@schoolph.umass.edu

  Affiliation Division of Biostatistics and Epidemiology, University of Massachusetts, Amherst, Massachusetts, United States of America

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• Jessica A. Myers,

  Affiliation Division of Pharmacoepidemiology and Pharmacoeconomics, Brigham and Women’s Hospital, Boston, Massachusetts, United States of America

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• Daniel Obeng,

  Affiliation Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

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• Aaron M. Milstone,

  Affiliation Department of Pediatrics, Division of Pediatric Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America

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• Trish M. Perl

  Affiliation Department of Medicine, Division of Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America

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