该文讨论了为PPS抽样的二相抽样时，其样本单位数的最优设计问题。并结合实例进行了分析。
In this paper, we given an approach for optimum design of sample sire in two-phase sampling for PPS, and discussed an example.
该文讨论了为PPS抽样的二相抽样时，其样本单位数的最优设计问题。并结合实例进行了分析。
In this paper, we given an approach for optimum design of sample sire in two-phase sampling for PPS, and discussed an example.
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