Question

请教 有统计学知识的英语达人，帮忙翻译一段英文，谢谢！

The exclusion of some colleges from NSC will induce measurement error in the
dependent variable. If this error is not correlated with treatment (i.e., classical
measurement error) then the true effect of class size on college enrollment will be
larger than our observed effect by the proportion of enrollment that is missed
(approximately 20 percent).This is because the true treatment effect is the sum of the
observed treatment effect and the treatment effect of the unobserved college attenders
(Bound, Brown, & Mathiowetz, 2001). However, if the measurement error in college
attendance is correlated with assignment to treatment then our effect could be either
downward or upward biased. This would be the case, for example, if colleges attended
by marginal students are disproportionately undercounted by NSC.
注：
1、NSC：全国学生资料库

2、如果用有道翻译之类的就算了，我也会用有道的哦

Answer 1

一些院校的排除从NSC会导致因变量的测量误差。如果此错误与不治疗（即，classicalmeasurement错误）然后班级规模对高校招生的真实效果将大大超过我们所观察到的效果就是错过了招生比例（约百分之20）。这是因为真正的治疗效果的观察及治疗效果的观察到院就诊治疗的效果总（绑定，棕色，和马修威兹，2001）。然而，如果在collegeattendance测量误差与分配处理我们的效果可以eitherdownward或向上偏相关。这将为例，如果是这样，高校学生出席是不成比例的边际统计委员会。

Answer 2

不会——————————————————————————————————————————————————