covariance for cluster sampling
整群抽样协方差
relative variance for cluster sampling
整群抽样的相对方差
Cluster Sampling Out of Clusters of Unequal Sizes
不等群下的整群抽样问题研究
Method cluster sampling and cross sectional study.
方法整群抽样, 横断面调查。
On twostage adaptive cluster sampling to assess pest density.
应用二阶适应性整群抽样估计害虫密度。
Study of Adaptive Cluster Sampling Technique on Vegetation in Ulan Buh Desert
内蒙古乌兰布和沙漠植被适应性群团抽样技术的研究
Methods 1621 students were investigated with questionnaire by random cluster sampling.
方法通过随机整群抽样，对1621名初中学生进行问卷调查。
Methods A questionnaire investigation among pupils, parents and teachers by cluster sampling.
方法采用整群抽样对学生和家长教师进行问卷调查。
Statistical Methods of Stratified Cluster Sampling on Sensitive Questions Survey and Its Application
敏感性问题分层整群抽样调查的统计方法及其应用
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