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简单说一下结论：
高中同班效应，尤其是同学母亲有大学学历的情况，会带来正的效应；而这个效应在一个人到达29-32岁左右的时候几乎消失殆尽；而这种效应也并没有对完成大学教育以及就业有显著效果。
通俗一点说：十年河东、十年河西；高中时的同学家庭的确能起很大作用，尤其是高知家庭，能很好的把握学习的特性和孩子的性格，让他们度过性格定型的高中时期。而以后的发展，则很难说高中同学能继续发挥余热（参见越来越少的高中同学聚会）。
用的方法很简单：panel data--National Longitudinal Study of Adolescent Health (Add Health) is a longitudinal survey that follows multiple cohorts of students from the same schools.
研究思路：
首先研究examine whether the impacts of high school cohort composition on college attendance are sustained（门槛问题。简单说一下，美国很多高中生毕业之后并不着急考入大学，有些人回去打工、创业、旅游、比赛等等，等想读的时候再申请入学）；
然后到examine whether or not the composition of one’s high school cohort has any longer term effects on college completion and labor market outcomes（程度）.
一些楼主注意到的细节：
1，本文认为attending school and classes with more educationally advantaged students, e.g. more students with college educated parents, might influence the development of academic skills, attitudes towards school, and college aspirations.
2，解决的难题之一：The primary challenge in estimating cohort composition effects is the potential correlation between unobserved student characteristics and cohort attributes created by self-selection of individuals into schools (Moffitt 2001).
回归比较简单，做的也是个很成熟的研究，但还是挺有意思。
Do Classmate Effects Fade Out.pdf
(234.17 KB)
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