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木棉与郁金香 · 2019年01月29日

问一道题:NO.PZ2016071602000025

问题如下图:

    

选项:

A.

B.

C.

D.

解释:


这个HF不是只投了SP500的ETF吗?为什么和SP500的回归beta会是0呢?

是不是只是因为回归的时间上有差异?

谢谢指导!

1 个答案
已采纳答案

orange品职答疑助手 · 2019年01月29日

同学你好,是的。因为对冲基金是每月结算盈亏,但他和投资者声称是每周结算,因此基金的收益和实际指数收益的波动是不同步的。两组变化不同步的数据,这里就认为它们是不相关的(甚至可能是独立的),所以COV(X,Y)=0,而回归系数等于COV(X,Y)/DX,所以回归系数贝塔等于0。

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