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AL · 2021年11月04日

Active risk , share and multi factor

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NO.PZ201809170400000603

问题如下:

Manager B’s portfolio is most likely consistent with the characteristics of a:

选项:

A.

pure indexer.

B.

sector rotator.

C.

multi-factor manager.

解释:

C is correct. Most multi-factor products are diversified across factors and securities and typically have high active share but have reasonably low active risk (tracking error), often in the range of 3%. Most multi-factor products have a low concentration among securities in order to achieve a balanced exposure to risk factors and minimize idiosyncratic risks. Manager B holds a highly diversified portfolio that has balanced exposures to rewarded risk factors, a high active share, and a relatively low target active risk—consistent with the characteristics of a multi-factor manager.

答案裡的 Multi factor model 是low concentration of stock 是什麼意思呢 不是每一個風險因子也有各自一類的股票代表這個因子嗎  那應該每一個因子也是high concentration的stock和high exposure to that risk? High active share 和 low active risk在這裡的multi factor model 的理解 是和benchmark 不一樣權重 但用的股票還是高度correlation?
2 个答案

笛子_品职助教 · 2021年11月04日

嗨,努力学习的PZer你好:


再补充一下,基础版190页开始的例题也要看一下,很多名词就是出现在这个例题里。以下是截图。


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笛子_品职助教 · 2021年11月04日

嗨,从没放弃的小努力你好:


Multi factor model 是low concentration of stock 是什麼意思呢

答案解析里的意思就是,Multi factor model来构建组合,会使得持股的集中度相对比较分散,并不会特别集中。


不是每一個風險因子也有各自一類的股票代表這個因子嗎 那應該每一個因子也是high concentration的stock和high exposure to that risk?

这句话的理解,完全正确。每个因子都是high concentration的stock。


但是我要补充一点,就是结合这个题目。每个因子都是high concentration的stock,但是Multi factor意味着多因子,也就是因子和因子之间是分散的。因子和因子之间是分散的,使得持股也是分散的,并不集中。


咋一看似乎比较费解,为什么每个因子都是持股集中的,但是10个因子放一起反而分散了呢。这里举个例子就明白了。

这里举个例子:比如有一个index有500只股票,然后用10个因子进行选股,每个因子选20只股票,那么每个因子选出的这20个股票之间,就是concentration的。但是,那么10个因子能选出200只股票,并且这200只股票分散在10个因子上,因此这200个股票之间,是有分散化效果的。总体而言,是可以认为,选出的这200值股票,是low concentration of stock。


 High active share 和 low active risk在這裡的multi factor model 的理解 是和benchmark 不一樣權重 但用的股票還是高度correlation?

首先还是肯定你问题,理解完全正确。

它就是和benchmark的持股不一样,但是还是有高度相关性。


知识点在以下截图(来自基础班讲义185页)。各种投资策略的active risk和active share



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