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kanjani · 2024年03月25日

怎么看出本题是样本不是总体的?

NO.PZ2019042401000061

问题如下:

A portfolio manager at a hedge fund manages an equity portfolio that is benchmarked to an index. The information on the performance of the portfolio and the benchmark over the last 5 years is provided below:


What is the approximate value of the manager’s information ratio?

选项:

A.

0.60

B.

0.20

C.

0.90

D.

1.08

解释:


IR = Average excess returns / Std dev of excess returns (IR = Alpha / Tracking error) Average excess returns: 0.0040 Std dev of excess returns: 0.0067 IR = 0.59

A is incorrect. It is found by dividing portfolio returns by benchmark returns and then taking the standard deviation of these ratios.

C is incorrect. It is the average of betas.

D is incorrect. It is found by dividing average portfolio returns by average benchmark returns.

如题,怎么想到还要判断是样本方差还是总体方差这一步的???

1 个答案

pzqa27 · 2024年03月25日

嗨,努力学习的PZer你好:


由于这里的数据是样本,所以求的是样本标准差,所以是用1/4而不是1/5.

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虽然现在很辛苦,但努力过的感觉真的很好,加油!