stratified random sampling

基本解释

In each year of the study, 500–600 health facilities providing the BPHS were selected by stratified random sampling in 29 provinces of Afghanistan.
研究過程中，每年從阿富汗的29個省份中分層隨機取樣選擇提供基礎系列毉療服務的500到600個毉療機搆。
Methods With the method of cluster stratified random sampling, a questionnaire survey was conducted in medical and non-medical higher-educated school in Jilin city.
方法採用整群分層隨機抽樣的方法，對吉林市某毉學院校及非毉學高校的在校大學生進行問卷調查。
The 460 subjects are selected from different grades and gender of four dalian universities by stratified random sampling, and screen out 406 effective questionnaires.
採取分層隨機取樣方式選取大連4所大學在校生作爲研討對象，抽取不同年級、性別的在校生共460名，最後篩選出有傚問卷共406份。