问题如下:
Which of the followings is least likely the consequence of the conditional heteroskedasticity?
选项:
A.The T-test is still reliable, but the F-test is unreliable.
B.The coefficient estimates are not affected.
C.The standard errors are usually unreliable estimates.
解释:
A is correct.
考点: Heteroskedasticity.
解析: 本题问的是哪个选项不是异方差造成的后果。A选项的描述是错误的,因为异方差会导致T-test和F-test都不靠谱(unreliable)。选择A。B和C选项的描述均是异方差产生的后果。
为什么协方差会影响coefficent的方差?为什么t,f检测都不准?没理解