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.
方法以分層整群隨機抽樣的方法選取三峽庫區0～6嵗兒童3034例，採用骨源性堿性磷酸酶（BALP）測定。
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Method Some food processing employees were selected according to stratified random sampling method, and filled in a unified questionnaire anonymously.
方法按照分層隨機抽樣原則隨機抽取部分食品從業人員，匿名獨自填寫統一的調查問卷。
Methods By using stratified random sampling method 524 college students were selected and surveyed with scales about sense of alienation and subjective well-being.
方法分層隨機抽取某高校524名大學生，採用疏離感和主觀幸福感量表進行施測。