||Comparison of Variance Estimators of the Horvitz-Thompson Estimator for Randomized Variable Probability Systematic Sampling.
Stehman, S. V. ;
Overton, W. S. ;
||State Univ. of New York Coll. of Environmental Science and Forestry, Syracuse. ;Oregon State Univ., Corvallis.;Corvallis Environmental Research Lab., OR.
||EPA-R-815422 ;EPA-R-816721; EPA/600/J-94/292;
Environmental surveys ;
Statistical analysis ;
Water pollution ;
Probability theory ;
Study estimates ;
Empirical equations ;
National Stream Surveys ;
Environmental Monitoring and Assessment Program ;
Horvitz-Thompson estimation ;
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Two large-scale environmental surveys, the National Stream Survey (NSS) and the Environmental Protection Agency's proposed Environmental Monitoring and Assessment Program (EMAP), motivated investigation of estimators of the variance of the Horvitz-Thompson estimator under variable probability systematic sampling. As is common in practice, survey objectives required special design and analysis features that strongly influenced selection of a variance estimator. In this article we investigate properties of the variance estimator used in the NSS and proposed for some applications in EMAP. (Copyright (c) 1994 American Statistical Association.)