Focus in data quality assessment is non-sampling errors and variance, in addition to sampling errors.

在数据质量评估中，我们除对抽样误差进行检查外，重点是对非抽样误差和偏差的检查。

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With theory of error analyzing and characteristics of Internet, this article analyzes the non - sampling errors of Internet surveys and comes up with some steps to reduce them.

本文结合调查误差分析的理论，根据网络自身的特点，分析了网络调查的非抽样误差的来源，并提出了减少误差的方法。

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