stratified simple random sampling

基本解釋

During the course of cluster sample verification, systematic sampling and stratified sampling"s accuracy are prior to simple random sampling"s.
群樣本檢驗(yàn)中，系統(tǒng)抽樣群樣本檢驗(yàn)和分層隨機(jī)抽樣群樣本檢驗(yàn)的效果優(yōu)于簡(jiǎn)單隨機(jī)抽樣群樣本檢驗(yàn)。
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.
在全國(guó)不同區(qū)域，選取18個(gè)省市的21家醫(yī)院，采用分層抽樣和簡(jiǎn)單隨機(jī)抽樣相結(jié)合的方法，收集調(diào)查問(wèn)卷1 704份，進(jìn)行統(tǒng)計(jì)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 .
具體介紹了砼強(qiáng)度檢測(cè)抽樣的幾種方法：現(xiàn)行規(guī)程抽樣法；簡(jiǎn)單隨機(jī)抽樣法；分層抽樣法。