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wukefu · 2024年06月22日

active risk 和active share 的关系

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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.

我的理解是active risk 包含了active shares(portfolio和Bench March 的weight不同) 和 correlation (portfolio和Bench March)这么理解对吗

  • If the factor exposure is fully neutralized, the Active Share will be entirely attributed to the active risk. 这句的理解是 correlation 很高,所以如果还有active risk,那么就是weight 不同=active share 的原因, 这么理解对吗?
  • The active risk attributed to Active Share will be smaller in more diversified portfolios. 这句话要如何理解?


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已采纳答案

笛子_品职助教 · 2024年06月24日

嗨,爱思考的PZer你好:


我的理解是active risk 包含了active shares(portfolio和Bench March 的weight不同) 和 correlation (portfolio和Bench March)这么理解对吗

Hello,亲爱的同学~

这么理解是正确的。


不同=active share 的原因, 这么理解对吗?

weight不同,是active share不同,这么理解正确。


The active risk attributed to Active Share will be smaller in more diversified portfolios. 这句话要如何理解?

active share贡献的active risk小,可以理解为active share小的意思。

由于默认benchmark是分散化组合,因此portfolio越分散,portfolio与benchmark权重差异就越小,active share就越小。


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