Methods: The stratified sampling and cluster random sampling methods are used in this survey.

方法：本研究采用分层随机抽样方法和整群随机抽样方法。

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The survey was completed on the basis of combining stratified sampling and random sampling, collecting 1005 valid samples in total.

调查在分层逐级抽样法与随机抽样法相结合的抽样基础完成，共收集有效样本1005个。

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A layered sampling model for fuzzy comprehensive evaluation was developed based on simple random sampling methods.

在简单随机抽样方法的基础上提出了分层抽样的模糊综合评价模型。

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In addition, firms need to do some random sampling to ensure guidelines are observed.

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ICM, have gone much further, partly or wholly switching from quota to random sampling.

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The best sort of random sampling is one that picks individuals out directly.

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