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American Journal of Epidemiology 2006 163(12):1157-1158; doi:10.1093/aje/kwj163
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American Journal of Epidemiology Copyright © 2006 by the Johns Hopkins Bloomberg School of Public Health All rights reserved; printed in U.S.A.

Letter to the Editor

RE: "EASY SAS CALCULATIONS FOR RISK OR PREVALENCE RATIOS AND DIFFERENCES"

L. Tian and K. Liu

Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611

(e-mail: lutian@northwestern.edu)

The first 10% of the full text of this article appears below.

We applaud Drs. Spiegelman and Hertzmark's idea of using SAS procedure PROC GENMOD to estimate the risk ratio or difference (1Go). However, we have reservations about 1) the claim that there is no good justification for fitting the logistic regression and estimating the odds ratio when the odds ratio is not a good approximation of the risk ratio, and 2) using Poisson regression . . . [Full Text of this Article]


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