...atified one stage cluster sampling : 分层一级整群抽样，分层一阶整群抽样 stratified multi-stage sampling : 分层多级抽样，分层多阶抽样 stratified multi-stage cluster sampling : 分层多级整群抽样，分层多阶整群抽样 ..
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分层多阶段抽样
stratified multi-stage cluster sampling 分层多级整群抽样
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Large-scale sample surveys are always undertaken with stratified multi-stage sampling.
大型抽样调查总是采用分层多阶段抽样。
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