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当我们看样本代表性的时候。
That's coming when we look at the representative of the sample.
本文给出了样本调换的概念和理论，并讨论了样本调换在改善样本代表性方面的应用。
In this paper, the concept and principle of sample adjustment are given, and the application of sample adjustment for improving the sample representativeness is also discussed.
皮尤研究中心对全国范围内具有代表性的1807名父母组成的样本进行了调查，发现课外活动反映了育儿方式的差异。
Extracurricular activities reflect the differences in child rearing in the Pew survey, which was of a nationally representative sample of 1,807 parents.
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