variance for cluster sampling
post cluster sampling : 选择初始样本后的整群抽样，事后整群抽样 variance for cluster sampling : 整群抽样方差 stratified cluster sampling : 分层整群抽样 ..
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短语
整群抽样协方差
[统计]
covariance for cluster sampling
整群抽样的方差估计值
variance estimates for cluster sampling