DESIGN: Cluster sampling and stratified analysis.
设计：整群抽样，分层分析。
DESIGN: a stratified random cluster sampling investigation.
设计：分层整群抽样调查。
The paper presents a typical self-weighting sample design for the stratified three-stage or over sampling.
本文提出了分层三阶段及以上抽样的自加权抽样设计方法。
The paper presents a typical self-weighting sample design for the stratified three-stage or over sampling.
本文提出了分层三阶段及以上抽样的自加权抽样设计方法。
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