Evaluation of Three Sample Size Formulae for 2 × 2 Contingency Tables

Chris W. Hornick and John E. Overall

Journal of Educational and Behavioral Statistics, 1980, vol. 5, issue 4, 351-362

Abstract: Estimates of sample size requirements for 2 × 2 tables, derived from three approximate formulae, were evaluated by comparison wlth exact calculations. Although different, the estimates derived from all three formulae were judged adequate for most practical purposes, with the most accurate results being obtained from Cohen's formula. The strategy for exact determination of the minimum N required to provide specified power for tests of significance of differences in proportions in two treatment groups is described.

Keywords: chi-square; 2 × 2 contingency tables; power; sample size (search for similar items in EconPapers)
Date: 1980
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Persistent link: https://EconPapers.repec.org/RePEc:sae:jedbes:v:5:y:1980:i:4:p:351-362

DOI: 10.3102/10769986005004351

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