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.
为什么会导致系数的inconsistent？老师不是说consistent的意思是变量个数n的增加，不会影响它的准确性吗。就算遗漏了某个变量x，但它能体现在残差项中，这个理解有问题吗？
