This paper studies the second stage sampling methods used in the two stage sampling survey for waterway transportation volume.
研究了采用二阶抽样对水路运输量进行抽样调查时的第二阶抽样方法。
The present balanced two-layer sample rotation system is applicable only to the monthly survey with two-stage sample designs and with small primary sampling units.
目前的平衡两层次样本轮换模式只适用于一级单元规模较小时的两阶段抽样月度调查。
Method:254 people aged 51~75 with two stage sampling were investigated by using multifactor analyses.
方法：采用二阶段抽样法对254名51～75岁居民用多因素分析法进行了调查分析。
For the ratio estimate in two-stage sampling, the bias and mean square errors(MES) of the estimater value have been obtained, and the estimater value of the MSE has been given.
给出了二阶比估计量的偏差、估计量的均方误差以及均方误差的估计。
Methods: the breakfast structure and the nutrition knowledge of 3 547 students in rural boarding middle school in Chongqing were investigated by adopting stratified two-stage cluster sampling method.
方法：采用分层二阶段整群抽样方法，对重庆市3 547名中学生早餐饮食结构和营养知识进行调查。
Methods: the breakfast structure and the nutrition knowledge of 3 547 students in rural boarding middle school in Chongqing were investigated by adopting stratified two-stage cluster sampling method.
方法：采用分层二阶段整群抽样方法，对重庆市3 547名中学生早餐饮食结构和营养知识进行调查。
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