NO.PZ2015120204000018
问题如下：
If an omitted variable is correlated with variables already included in the model, coefficient estimates will be biased and inconsistent and standard errors will also be inconsistent. Is this Statement correct?
选项：
A.Yes.
B.No, because the model’s coefficient estimates will be unbiased.
C.No, because the model’s coefficient estimates will be consistent.
解释：
A is correct.
Chang is correct because a correlated omitted variable will result in biased and inconsistent parameter estimates and inconsistent standard errors.
遗漏变量带来的结果不是异方差和自相关么？这两个问题都是不影响系数的啊？而且老师课上也说遗漏变量主要是影响残差项，和系数有什么关系？
