方法对样本单位进行调查表调查、院长访谈和员工座谈。
Methods Investigate the sample hospitals with survey forms, interview leaders and employees.
本文讨论了存在不回答样本单位时，有限总体均值的缺损样本估计。
This paper deals with the incomplete sample estimation of finite population mean in existing of nonrespondent sampling units.
影响抽样误差大小有很多因素，如标志变异程度，样本单位数量的多少，抽样方式方法的选择等。
There are many factors that influence the sampling error, such as, extent of mark variation, amount of sample unit and the choice of sampling method, etc.
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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