stratified multi-stage sampling
...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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短语
多级分层随机抽样
[统计]
multistage stratified random sampling
分层多级整群抽样
stratified multi-stage cluster sampling