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Betty · 2024年07月11日

这道题做对了,但是很疑惑看到之前的回答

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NO.PZ202207040100000404

问题如下:

The fund in Exhibit 3 that is most consistent with Quint’s requirements is:

选项:

A.Ash. B.Blue. C.March.

解释:

Solution

C is correct. The March Fund is the fund that is most consistent with Quint’s requirements for the best risk-efficient delivery of results. It delivers the lowest active risk (3.2%) using far fewer securities (140), indicating an efficient approach. The higher Active Share (0.75) for the similar level of fees also supports this decision.

A is incorrect. Ash has the highest active risk, which indicates active return contributions of a greater dispersion than the benchmark and the competing funds. More securities and lower Active Share are not supportive of this fund choice.

B is incorrect. Blue has the highest number of securities and a relatively low Active Share. Although the overall portfolio volatility is the lowest of the three (producing a higher Sharpe ratio), the more relevant risk is that attributable to active management. Greater active risk despite more securities is not the most efficient method.

这道题我是根据active share最大的选的,但是我看之前的回答说是要看active share/active risk? 没有这个公式吧?

是active return/active risk不是吗?不过那是计算information ratio,跟这种题型没关系吧?

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笛子_品职助教 · 2024年07月12日

嗨,爱思考的PZer你好:


所以就是,如果是问答题,不能这么写出来active share/active risk? 但如果做选择题,可以用这个思路。是这样吗?

同学理解正确。是这样。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!

笛子_品职助教 · 2024年07月12日

嗨,爱思考的PZer你好:


risk - efficiency原版书定义是:

在active share相同的时候,选active risk最小的。

在active risk相同的时候,选active share最大的。


老师根据原版书给的这两点,将其合并,即选择:active share/active risk,最大的。

因为无论是active share相同,选active risk最小。

还是active risk相同,选active share最大。

数学上都可以统一成:active share/active risk,最大的。


这是为了方便记忆的,辅助记忆的内容并非原版书要求,只是解题技巧或者记忆经验。可以忽略。

尤其是如果辅助记忆的内容不是那么好理解的话,同学这里只根据原版书的定义来解题,也是没问题的。

----------------------------------------------
虽然现在很辛苦,但努力过的感觉真的很好,加油!

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