非观测效应，以及样本选择偏差和测量误差所引发的内生性问题对结果的影响很大，导致普通最小二乘法低估了我国的教育收益率。
The study also finds that unobserved effects, sample selection bias and measurement errors play important role on results, and OLS really underestimates yield of schooling.
约翰评定评估信赖过度风险为10%。他选择了60个抽样单位为样本，而且考试中没有发现任何偏差。
John determined that the acceptable risk of assessing control risk too low is 10%. He selected a sample of 60 sampling units and tested without any deviation found.
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