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坏呼呼嘿嘿 · 2023年09月02日

C选项什么意思,active risk 不应该和benchmark 风险特征有关吗,和idiocycratic vol有什么关系

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NO.PZ202207040100000803

问题如下:

In Lazare and Warrack’s comments about Active Share and active risk, the comment that is least accurate is the one concerning:

选项:

A.portfolio diversification. B.neutralizing factor exposure. C.increasing idiosyncratic volatility.

解释:

Solution

B is correct. The comment concerning neutralizing factor exposure is incorrect: In a single-factor model, if the factor exposure is neutralized, the active risk will be entirely attributable to the Active Share—a consequence of the manager deviating from benchmark weights. The active risk attributed to Active Share will be smaller for more diversified portfolios with lower idiosyncratic risk. Active risk does rise with an increase in factor and idiosyncratic volatility.

A is incorrect. The active risk attributed to Active Share will be smaller for more diversified portfolios with lower idiosyncratic risk.

C is incorrect. Active risk does rise with an increase in factor and idiosyncratic volatility.

如题

1 个答案

笛子_品职助教 · 2023年09月04日

嗨,努力学习的PZer你好:


这里需要理解idiocycratic vol这个名词的含义。

idiocycratic vol是指特异化波动。特异化波动指的是,某个微观资产,特有的一些微观风险,所体现出的波动。

例如,某个公司的董事长,突然毫无预期的生病无法管理公司,这就是特异化风险。


在以上知识点基础上,我们再看active risk与idiocycratic vol的关系。

benchmark只体现系统性风险。portfolio既体现系统性风险,也体现了特异性风险。

特异化风险越高,portfolio与benchmark的差距越大,active risk衡量portfolio与benchmark收益差的波动性,因此active risk也就越高。


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