问题如下:
3. What is the correlation between X and Y?
选项:
A.-0.7436.
B.0.7436.
C.0.8623.
解释:
C is correct.
For a regression with one independent variable, the correlation is the same as the Multiple R with the sign of the slope coefficient. Because the slope coefficient is positive, the correlation is 0.8623.
仍然想追问下multiple R和第三个表中coefficient之间的关系:
助教在之前的提问中解释说:multiple R 代表的就是真实的Y和预测的Y的相关系数的绝对值。其实就是R square开根号。而第三张表的那些是回归方程的系数,这两者是完全不同的概念。
想问下具体是哪里不同?相关性不就是通过回归方程的系数来表示吗?