NO.PZ2020010801000024
问题如下:
Suppose Yi and Xi followed a bivariate normal so that:
What is the in a model that regresses Y on X? What would the be in a model that regressed X on Y?
选项:
解释:
Because this is a regression with a single explanatory variable, the is the squared correlation. The correlation is and so the . The is the same in both regressions because it only depends on the correlation between the variables.
您好,我看了以前的问答,但是还是想问这道题。因为在讲义中讲了这个矩阵,但是没细讲,但是题目中是有的,因此,还请把这道题讲清楚。另外,讲义中说了解的问题,其实不是不考,反而经常出现在题目里。因此,麻烦请详细解答下该题,作为案例记下来。谢谢