The instrumental variable in this instance allows a clear, credible estimate of the return from extra schooling for those most inclined to drop out from school early.
在这一研究中，对于那些倾向于尽早离开学校的人而言，使用辅助变量法就能够得出清晰可信的结果。
Up to a third of students with ADHD drop out of high school, and they're also less likely to attend and graduate from college.
三分之一患有该病的学生高中就辍学了，他们继续完成大学学业的可能性也不大。
China and other countries found that even when children from the countryside do start school, they have a tendency to be absent and often drop out later.
中国和其他国家都发现，即使农村孩子上了学，他们会常常缺课，到最后还得辍学。
China and other countries found that even when children from the countryside do start school, they have a tendency to be absent and often drop out later.
中国和其他国家都发现，即使农村孩子上了学，他们会常常缺课，到最后还得辍学。
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