cluster random sampling造句

例句与造句

1. The regression estimator in cluster random sampling
   整群抽样回归估计量
2. In order to study the awareness , treatment and control rates andthe risk factors of hypertension in qingdao rural residents , a cluster random sampling method was used
   为了调查青岛农村居民高血压的患病率、知晓率、服药率、控制率及其影响因素，采用整群随机抽样法，对7个村的18岁以上居民进行血压测量及相关因素调查。
3. It's difficult to find cluster random sampling in a sentence. 用cluster random sampling造句挺难的