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American Journal of Epidemiology Vol. 128, No. 1: 247
Copyright © 1988 by The Johns Hopkins University School of Hygiene and Public Health

correction

ERRATUM

ABSTRACT

The Journal wishes to point out a printer's error in the article "Estimation of Sample Sizes in Case-Control Studies with Multiple Controls per Case: Dichotomous Data" by Kung-Jong Lui which appeared in the May 1988 issue (Am J Epidemiol 1988;127:1064–70).

The last paragraph on page 1066 should read, "To evalute the accuracy of formulae 2–4, which assume the homogeneity of the probabilities of exposure among matched sets, in the following discussion we will focus on the powers based on random {rho}." The two lines that follow were incorrectly transposed from the top of the left-hand column on page 1069. That paragraph, beginning on page 1068, should read, "Finally, note that the required sample sizes of cases from formulae 2–4 for f = 0.9 (table 3) are much larger than those for f = 0.1 (table 1) or f = 0.5 (table 2); they are not symmetric in f. For odds ratios less than one, we can obtain the required sample size of cases by noting that sample size(OR, f) = sample size(1/OR, 1 – f)."

The printer apologizes to Dr. Lui and to the readers for any inconvenience.


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