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张文文 · 2021年03月09日

问一道题:NO.PZ201710100100000504 第4小题 [ CFA II ]

* 问题详情,请 查看题干

问题如下:

4. Which of Singh’s statements regarding the information ratio is correct?

选项:

A.

Only Statement 1

B.

Only Statement 2

C.

Both Statement 1 and Statement 2

解释:

C is correct.

The information ratio for a portfolio of risky assets will generally shrink if cash is added to the portfolio. Because the diversified asset portfolio is an unconstrained portfolio, its information ratio would be unaffected by an increase in the aggressiveness of active weights.

考点: information ratio

解析: 定性结论,Statement 1 正确,增加cash会导致information ratio减小。Statement 2正确,增加aggressiveness不会改变information ratio。

老师 这道题可以深入解释一下为什么add cash会导致IR下降吗?我笔记上记了IR is unaffected by the addition of cash or the use of leverage or by the aggressiveness of active weights 请问哪里错了呀 谢谢老师!
1 个答案

星星_品职助教 · 2021年03月09日

同学你好,

笔记有一点问题,应该是:

SR(Sharpe ratio)is unaffected by the addition of cash or the use of leverage(这是因为SR是CML的斜率,增加或减少现金/杠杆只会使投资组合在CML线上移动,不会改变斜率);

②IR is affected by the addition of cash or the use of leverage(这是因为IR衡量基金经理主动管理能力,增加cash相当于不投资,即降低主动管理能力);

③IR is unaffected by the aggressiveness of active weights (这是因为IR的分子分母同比例增加/减少,最后分数值不变)

以上三条的括号里的原因都不用记忆,记忆最终结论即可。

附上相关讲义供参考。

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NO.PZ201710100100000504 问题如下 4. Whiof Singh’s statements regarng the information ratio is correct? A.Only Statement 1 B.Only Statement 2 C.Both Statement 1 anStatement 2 C is correct. The information ratio for a portfolio of risky assets will generally shrink if cash is aeto the portfolio. Because the versifieasset portfolio is unconstraineportfolio, its information ratio woulunaffecteincrease in the aggressiveness of active weights.考点 information ratio解析 定性结论,Statement 1 正确,增加cash会导致information ratio减小。Statement 2正确,增加aggressiveness不会改变information ratio。 老师,这最后一道题如何判断有没有TC啊?我看文字上没明确说表述出来,那与表二有关么?我看表二里有TC

2023-10-14 19:28 1 · 回答

NO.PZ201710100100000504 aggressiveness下降的意思和增加cash进去使得基金经理积极主动管理能力下降是一个吗 aggressiveness不影响IR所以cash是不是也不会影响IR 那statement1是错的吗

2021-03-11 19:28 2 · 回答

您好,根据SR^2=SRb^2+IR^2,一个risky asset的sharp ratio可以拆分成benchmark的sharp ratio和IR,在这个risky asset里增加cash,根据sharp ratio的性质左边SR肯定不会变,右边SRb是benchmark的sharp ratio,benchmark是一个固定portfolio sharp ratio应该也不会变,既然两个sharp ratio都不会变,那增加cash IR减少这个等式要怎么平衡?谢谢

2020-08-21 20:55 1 · 回答

    constrain funIR会收到aggressive的影响。而这题的portfolios's TC<1,因此是constrain fun这两个comment跟在这道题下面,让我认为statement 2是错的。

2019-05-22 13:20 1 · 回答