Variance Estima Tion in the Census 2000 A.c.e. Subsamples
نویسنده
چکیده
Stratified random sampling at differential rates is commonly used in social science surveys to improve the chances of getting sufficiently large samples of subpopulations of interest. Multi-phase sampling is often used to further target desired populations. The variances of such samples can be estimated using jackknifing, which creates replicated values of the characteristic of interest as if one sampling unit had not been part of the sample, then sums the squared differences between those replicates and the population total. Kim (2000) suggested a method for estimating the variance in a three-phase design in which the first two phases were stratified and the third was a simple random sample from among the sample units in the second phase. In this paper, Kim’s method is extended to a three-phase design in which all three phases are stratified samples at differential rates, but the last phase is stratified by characteristics not related to those used in stratifying the first two phases.
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