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Examples of Differing Weighted and Unweighted Estimates from a Sample Survey

Edward L. Korn and Barry I. Graubard
The American Statistician
Vol. 49, No. 3 (Aug., 1995), pp. 291-295
DOI: 10.2307/2684203
Stable URL: http://www.jstor.org/stable/2684203
Page Count: 5
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Examples of Differing Weighted and Unweighted Estimates from a Sample Survey
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Abstract

Unweighted estimators using data collected in a sample survey can be badly biased, whereas weighted estimators are approximately unbiased for population parameters. We present four examples using data from the 1988 National Maternal and Infant Health Survey to demonstrate that weighted and unweighted estimators can be quite different, and to show the underlying causes of such differences.

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