问题如下:
Both and only increase when adding a new variable. True or false?
选项:
解释:
False. will always increase. can decrease if the degree-of-freedom adjusted residual variance estimator, , does not decrease when adding a new regressor. This can happen because k is the number of regressors in the model and so if the numerator does not change, adding an additional regressor will increase k and so decrease the denominator.
右边那个是adjust R2的标志吗