... 整群随机抽样 cluster random sampling 整群样本 cluster sample 整群样本均值 cluster sample mean ...
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area cluster sample 区域聚类样本
multistage cluster sample 多段聚类样本 ; 多段聚样本
cluster sample mean [统计] 整群样本均值
a cluster sample 整群抽样
stratified cluster sample 分层整群抽样
standard cluster sample survey 标准组群抽样法
classified cluster sample survey 分类整群抽样
sample cluster [统计] 样本群 ; 样品聚类
Methods A cluster sample of 8 054 students(aged 12-18 years) were chosen from 28 middle schools in Guangzhou.
方法采取整群抽样方法，对广州市28所中学12~18岁的中学生8 054名进行吸烟状况的问卷调查。
At first, the original samples were pretreated by using the membership class function that can improve the quality of cluster sample.
首先，利用“类属函数”对原始样本进行预处理，以提高聚类样本的质量；
The cluster sample method is most often used because, in the initial stages of emergencies, people are rarely living in a structured pattern.
分组抽样方法是最常用的，因为在紧急情况的初期，人们很少住在有组织的环境中。
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