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。

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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。

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Today, students from low-income families are five times as likely to drop out of school as students from high-income families, according to data from the Department of Education.

WSJ: Arthur Brooks: The GOP's Hispanic Opening

From being the son of (ethnic-German) immigrants from Hungary, a high-school drop-out, a taxi-driver and self-styled street-fighter, to lauded statesman: it all sounded rather romantic.

ECONOMIST: Charlemagne

The high-school drop-out rate, for example, would fall only from 17.3% to 16.1%, and the proportion of teenage mothers from 20% to 18%.

ECONOMIST: Can��t buy me love