狂狷 · 2021年11月11日
NO.PZ2021061603000038
问题如下：
Homoskedasticity is best described as the situation in which the variance of the residuals of a regression is:
选项：
A. zero
B. normally distributed
C. constant across observations
解释：
C is correct. Homoskedasticity is the situation in which the variance of the residuals is constant across the observations.
为什么C正确而只不正确NO.PZ2021061603000038问题如下Homoskesticity is best scribethe situation in whithe varianof the resials of a regression is: A.zeroB.normally stribute.constant across observationsC is correct. Homoskesticity is the situation in whithe varianof the resials is constant across the observations.不是说残差项符合正太分布么。那B也对哇
NO.PZ2021061603000038 请问B为什么不对？如果是 Constant，就不可能Normstribution,是同一个常量就不应该变化吧。
NO.PZ2021061603000038 记得课程中有提到，残差项的方差为0，不太理解这里为什么选C，麻烦下不选A，选C的原因，感谢
