NO.PZ2020010801000018
问题如下:
When is less than 0? Can this measure of fit be larger than 1?
解释:
is always less than and so cannot be larger than 1. It can be smaller than 0 if the model explains virtually nothing and the degree-of-freedom loss is sufficient to push its value negative.
请问这个题目加答案在说啥?看不明白,也不知道与哪个知识点有关。