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American Journal of Epidemiology Vol. 105, No. 4: 387-397
Copyright © 1977 by The Johns Hopkins University School of Hygiene and Public Health

other

DETERMINATION OF SIGNIFICANT RELATIVE RISKS AND OPTIMAL SAMPLING PROCEDURES IN PROSPECTIVE AND RETROSPECTIVE COMPARATIVE STUDIES OF VARIOUS SIZES

S. D. WALTER1

1 Department of Epidemiology and Public Health, Yale University 60 College St., New Haven, CT 06510

Methods are given for determining the relative risks which it is possible to demonstrate as statistically significant with given probability in prospective and retrospective studies of a particular size. Also considered is the ratio of the sample sizes in the two groups being compared which will provide the most precise estimate of relative risk for a given total sample size.

biometry; epidemiologic methods; prospective studies; retrospective studies; sampling studies


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