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.
是不是模型只要是misspecification，就一定会同时引起bias和inconsistency？
