We also put detailed description on sample selection and data source.

此外还介绍了样本的选取方法和数据来源.

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Sample Selection Bias as a Specification Error.

发现并提出“选择性样本”问题.

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The results are robust to corrections for sample selection and alternative estimation methods.

结果是,具有较强的鲁棒性和可选择更正为样本估计方法.

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Heckman , J . J . ( 1979 ), Sample selection bias as a specification error , Econometrica, 47, 153 - 161.

样本选择偏差, 一看就知道是个很重要的问题嘛, 排名第五, 不算亏待.

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