multi-stage random cluster sampling 群抽样
stratified random cluster sampling 群分层随机抽样
cluster random sampling [统计] 整群随机抽样 ; 随机抽样 ; 样法 ; 群抽样
Stratified cluster random sampling 分层整群随机抽样
cluster random sampling method 整群随机抽样方法
multi-stage cluster random sampling 多阶段整群随机抽样
cluster systematic random sampling method 束系统随机抽样方法
random and cluster sampling 随机整群抽样
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