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Power and Sample Size for Testing Homogeneity of Relative Risks in Prospective Studies
Author(s) -
Nam JunMo
Publication year - 1999
Publication title -
biometrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.298
H-Index - 130
eISSN - 1541-0420
pISSN - 0006-341X
DOI - 10.1111/j.0006-341x.1999.00289.x
Subject(s) - homogeneity (statistics) , statistics , relative risk , mathematics , sample size determination , econometrics , confidence interval
Summary. Power and sample‐size formulas for testing the homogeneity of relative risks using the score method are presented. The homogeneity score test (Gart, 1985, Biometrika 72 , 673–677) is formally equivalent to the Pearson chi‐square test, although they look different. Results of this paper may be useful in assessing the validity of the model of a common relative risk before combining several 2 × 2 tables or in designing a prospective study for detecting heterogeneity of relative risks.