问题如下:
A portfolio manager is interested in the systematic risk of a stock portfolio, so he estimates the linear regression: ,where is the return of the portfolio at time t, is the return of the market portfolio at time t, and is the risk-free rate, which is constant over time. Suppose that α = 0.008, β = 0.977, = 0.167, and = 0.156.
What is the approximate coefficient of determination in this regression?
选项:
A.0.913
B.0.834
C.0.977
D.0.955
解释:
the R-squared is given by
请问相关系数=b*X的标准差/Y的标准差这个是怎么来的呢