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American Journal of Epidemiology Vol. 144, No. 1: 102-106
Copyright © 1996 by The Johns Hopkins University School of Hygiene and Public Health

other

Survey Inference for Subpopulations

Barry I. Graubard1, and Edward L. Korn2

1Biometry Branch, National Cancer Institute Bethesda, MD
2Biometric Research Branch, National Cancer Institute Bethesda, MD

Reprint requests to Dr. Barry I. Graubard, National Cancer Institute, Biometry Branch EPN-344, Bethesda, MD 20892.

One frequently analyzes a subset of the data collected in a survey when interest focuses on individuals in a certain subpopulation of the sampled population. Although it may seem natural to eliminate from the data set all data from individuals outside the subpopulation before analysis, this procedure may yield incorrect standard errors and confidence intervals. The authors give two examples of this using data from the 1987 National Health Interview Survey and the 1986 National Mortality Followback Survey. The correct method of analysis is described, as well as a simple condition that, when satisfied, ensures that the elimination approach yields identical answers to the correct method. Am J Epidemiol 1996; 144: 102–6.

epidemiologic methods; statistics


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