例句與造句

1. The regression estimator in cluster random sampling
   整群抽樣回歸估計量
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
   為了調查青島農村居民高血壓的患病率、知曉率、服藥率、控制率及其影響因素，采用整群隨機抽樣法，對7個村的18歲以上居民進行血壓測量及相關因素調查。
3. It's difficult to find cluster random sampling in a sentence. 用cluster random sampling造句挺難的