Proper design of sampling and survey methods can increase substantially the accuracy and usefulness of assessment data.

设计适当的抽样和调查方法，可以充分的提高评估数据的准确性，实用性。

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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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Methods Complying with the united plan of medical survey nationwide, we combined sampling survey in various layers with general survey and typical survey.

方法遵照全国医疗照射调查的统一方案，采用分层抽样调查、普查和典型调查相结合。

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In India many more sampling points have been established, and in all countries better survey methods, relying on surveyors knocking on doors rather than asking questions at clinics, have gathered data from more representative samples.

ECONOMIST: AIDS