cluster sampling

常见例句

双语例句

• DESIGN:A stratified randomised cluster-sampling investigation.
  设计：分层随机整群抽样调查。
• Method: questionnaire was used to investigate 200 male out -patients in STD clinic selected with cluster-sampling method.
  方法：采用随机抽样对目标人群进行问卷调查。
• Methods A survey on prevalence of FD in communities of Shijiu Neighborhood, Rizhao was conducted by using a stratified, randomized cluster-sampling method.
  方法采用随机分层整群抽样方法，对日照市石臼街道常住人群进行面访式问卷调查。
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