stratified simple random sampling

基本解释

During the course of cluster sample verification, systematic sampling and stratified sampling"s accuracy are prior to simple random sampling"s.
群样本检验中，系统抽样群样本检验和分层随机抽样群样本检验的效果优于简单随机抽样群样本检验。
We had applied methods of stratified sampling and simple random sampling and collected 1 704 questionnaires in 21 various hospitals, 18 provinces, then analyzed them.
在全国不同区域，选取18个省市的21家医院，采用分层抽样和简单随机抽样相结合的方法，收集调查问卷1 704份，进行统计分析。
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This paper introduced several methods about the concrete strength inspection: the sampling method given by the present specification; simple random sampling without replacement; stratified sampling .
具体介绍了砼强度检测抽样的几种方法：现行规程抽样法；简单随机抽样法；分层抽样法。