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本文证明了二级抽样(包括单级整群抽样与层含量相等的按比例分层抽样)的平均精度与简单抽样的精度相等,并讨论了这几种抽样法的相对精度随群分法的变动情况。
This paper proves that the average precision of two-stage sampling (including proportional stratified sampling of single-stage cluster sampling and layering) is equal to that of simple sampling, and discusses the relative accuracy of these sampling methods Changes.