NO.PZ2018122701000052
问题如下:
Risk analyst uses data from the HS300 index over the past 260 weeks to estimate the long-term average correlation of the common stocks and mean reverting rate. And find the average long-term stock correlation of the HS 300 Index is 22%, and the regression output estimates the following regression relationship: Y = 0.34-0.55X. Assume that in first week of March 2020, the average weekly correlation of all HS300 stocks was 65%. Based on the mean reverting rate in regression analysis, what is the estimated one-week autocorrelation?
选项:
A.21.9%
B.23%.
C.35%
D.45%
解释:
D is correct.
考点:Autocorrelation
解析:单期自相关率+均值回归率=1,所以自相关率只要拿1减去均值回归率,即1-0.55=0.45
.
解析:单期自相关率+均值回归率=1,所以自相关率只要拿1减去均值回归率,即1-0.55=0.45
.
李老说,如果是正的就是trending,所以是auto=0.55,然后回归系数是0.45?
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题目求的是autocorrelation,就是1-α。
但是αμ=0.34。根据μ求出α=1.55
1-α=-0.55。
后面为什么要再加上1,不懂,盼复