Unequal Probability sampling design 不等概率抽样设计
sampling with unequal probability [统计] 不等概率抽样
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In this paper it not only gives the method of unequal probability in group sampling and unbiassedness of mean estimation and also gives the variance and its unbiassedness of estimation.
本文给出了集团抽样的不等概方法和均值的无偏估计，同时也给出了这种估计的方差及方差的无偏估计。
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