stratified random sampling method

基本解释

Methods 3034 children between 0 to 6 years in three Gorges reservoir were selected by stratified random sampling method.
方法以分层整群随机抽样的方法选取三峡库区0～6岁儿童3034例，采用骨源性碱性磷酸酶（BALP）测定。
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Method Some food processing employees were selected according to stratified random sampling method, and filled in a unified questionnaire anonymously.
方法按照分层随机抽样原则随机抽取部分食品从业人员，匿名独自填写统一的调查问卷。
Methods By using stratified random sampling method 524 college students were selected and surveyed with scales about sense of alienation and subjective well-being.
方法分层随机抽取某高校524名大学生，采用疏离感和主观幸福感量表进行施测。