title: Sample size calculation for epidemiologic studies: principles and methods.
abstract: This paper discusses the statistical principles, methods, and software programs used to calculate sample size. In addition, it reviews the practical challenges faced in calculating sample size. We show that because of such challenges, statistical calculations often do not provide us with a clear-cut number for the study sample size; rather they suggest a range of reasonable numbers. The paper also discusses several important nonstatistical considerations in determination of sample size, such as novelty of the study and availability of resources.
authors: School of Community Health and Policy, Morgan State University, Baltimore, MD 21251, USA. farin.kamangar@morgan.edu
authors: Farin
authors: F
authors: Kamangar
authors: Farhad
authors: F
authors: Islami
mesh_terms: D004812:Epidemiologic Methods; D016021:Epidemiologic Studies; D015233:Models, Statistical; D012107:Research Design / Q000706:statistics & numerical data*; D018401:Sample Size; D012984:Software