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.
您好，我听何老师讲到omit important variables这里强调过，会导致系数估计和标准误都是unreliable，但是没有提到consistency的内容。请问这里consistency也会受影响是怎么理解呀？谢谢。
