Sample Size in Epidemiologic Studies
Published Online: 15 JUL 2005
Copyright © 2005 John Wiley & Sons, Ltd
Encyclopedia of Biostatistics
How to Cite
Liu, G. 2005. Sample Size in Epidemiologic Studies. Encyclopedia of Biostatistics.
- Published Online: 15 JUL 2005
This article provides a broad overview of sample size determination methods for epidemiologic studies. Concepts related to sample size and power calculations are introduced. Formulas for sample size calculations are given for cohort and case–control (unmatched or matched) studies with binomial and Poisson outcomes. Methods for sample size calculations in survival studies and longitudinal studies are also presented. Factors that may affect the sample size and study power are discussed. A brief review of the computational methods and software packages commonly used for sample size calculations is also provided.
- cohort studies;
- case–control studies;
- confounding variables;
- survival studies;
- longitudinal studies