stratified random sampling

Methods Stratified chester random sampling.

方法采用分层整群随机抽样的调查方法.

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Methods: The self-designed questionnaires were used to anonymously investigate on179 students in19 academies of the university who were selected by stratified random sampling.

方法：运用笔者自行编制的问卷，采取分层随机抽样的方法对山西师范大学19个专业的179名大学生进行匿名调查。

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According to the social economy and geography of these regions, Stratified random sampling was adopted and the surveyors are 2540 people.

根据各地区的社会经济发展水平和地理分布，采用分层随机抽样的方法，共调查了2540人。

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Method: Form the multilevel stratified random sampling, we sampled six communities from the two street offices.

对象和方法：通过多阶段分层随机抽样方法抽取天山区2个街道办事处6个社区。

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At the same time it was analyzed how to stratify the stratums and define the optimal samples by the stratified random sampling in the study of street tree populations, and some formulas were introduced for calculating the parameters of the urban street tree populations.

其中着重分析了在城市街道绿化树种结构研究中运用分层随机抽样调查法应如何进行分层与如何确定合适的样本量；

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Stratified random sampling of forest survey

森林分层随机抽样调查

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Stratified random sampling technique Nanjing 450 college students were tested.

采用分层随机抽样的方法抽取450名南京在校大学生被试。

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The Stratified Random Sampling Method and Small Sample Testing

分层随机抽样方法与小子样检验

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Estimation of the Geometric Mean in Stratified Random Sampling

分层抽样中几何平均数的估计

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The Method of Mixed two-phase Stratified Sampling in Market Research; Methods Stratified chester random sampling.

市场调研中的混合双重分层抽样方法方法采用分层整群随机抽样的调查方法。

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[ Methods] Investigation was conducted in residents over 15 from 6 villages and 3 street district with multiplestage stratified chester random sampling method in Wuhan in 2002. [ Results] Of the 356 people investigated, the morbidity rate of the disease was 2.81%.

[方法]2002年用多阶段分层整群随机抽样方法，抽取武汉市蔡甸区3个街、6个村的部分15岁以上居民进行调查。[结果]调查356人，糖尿病患病率为2.81%。

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Methods: The number of samples was calculated with the optimum allocation stratified random sampling survey.

应用最优分配随机分层抽样方法确定调查点.

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Methods A total of 198 nurses using stratified random sampling in proportion to the ratio of different levels of the nurses. A questionnaire with approved validity was used in the survey, and the results were statistically analyzed.

方法参考TQC的相关知识，自行设计问卷，采用按护士层次比例分层随机抽样的方法抽取198位护士，采用统一发放、集中收回的调查方式。

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