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^(* ̄(oo) ̄)^进击ing🍬🍬 · 2020年06月17日

问一道题:NO.PZ2020011303000237

问题如下:

Previous question:Suppose a portfolio has an exposure of +50 to a one basis-point increase in the five-year Treasury rate in Table 13.1, an exposure of -100 to a one-basis-point increase in the ten-year Treasury rate in Table 13.1, and no other exposures.

Using Table 13.2, calculate the standard deviation of the daily change in the portfolio in the previous question based on its exposure to the first two factors.

选项:

解释:

Using Table 13.2, the standard deviation is

(14.152 × 20. 92 + 4.912 × 29.452 )1/2= 329.19

(14.152 × 20. 92 + 4.912 × 29.452 )1/2= 329.19 不明白为什么算标准差 把第一问的exposure给放进来???

2 个答案

袁园_品职助教 · 2022年03月28日

嗨,爱思考的PZer你好:


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就算太阳没有迎着我们而来,我们正在朝着它而去,加油!

袁园_品职助教 · 2020年06月18日

同学你好!

因为要求portforlio的 SD,你要知道每个 factor 的SD和portfolio在各个factor上的exposure啊,这就好像你算平均数不但要知道权重,也要知道各个权重对应的数值。

你可以再去听一下“Estimating Portfolio Volatility”这一节的视频

jacqie · 2022年03月28日

权重我明白,但是为什么20. 92和29.452是权重?又不是%?

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NO.PZ2020011303000237问题如下 Suppose a portfolio hexposure of +50 to a one basis-point increase in the five-yeTreasury rate in Table 13.1, exposure of -100 to a one-basis-point increase in the ten-yeTreasury rate in Table 13.1, anno other exposures. Using Table 13.2, calculate the stanrviation of the ily change in the portfolio above baseon its exposure to the first two factors. The exposure to one unit of the first factor is 50×(−0.410)−100×(−0.414)=20.950\times(-0.410)-100\times (-0.414)=20.950×(−0.410)−100×(−0.414)=20.9The exposure to one unit of the seconfactor is 50×0.203−100×(−0.193)=29.4550\times0.203-100\times(-0.193)=29.4550×0.203−100×(−0.193)=29.45Using Table 13.2, the stanrviation is14.152×20.92+4.912×29.452=329.19\sqrt{14.15^2\times20.9^2+4.91^2\times29.45^2}=329.1914.152×20.92+4.912×29.452​=329.19题目问假设有一个组合,当5年的treasury利率上升1bp时,exposure变成+50;10年的treasury利率上升1bp时,exposure变成-100。没有其他的exposure。根据图表与前两个factors,计算一天的组合标准差。先根据下图前两个factor,求组合的exposure。factor 150 × (−0.410) − 100 × (−0.414) = 20.9factor 250 × 0.203 − 100 × (−0.193) = 29.45组合标准差=14.152×20.92+4.912×29.452=329.19\sqrt{14.15^2\times20.9^2+4.91^2\times29.45^2}=329.1914.152×20.92+4.912×29.452​=329.19 对于计算组合方差疑问,应该用组合的权重乘以各自因素的方差,不应该是绝对值。谢谢

2023-03-23 17:53 4 · 回答

NO.PZ2020011303000237问题如下 Suppose a portfolio hexposure of +50 to a one basis-point increase in the five-yeTreasury rate in Table 13.1, exposure of -100 to a one-basis-point increase in the ten-yeTreasury rate in Table 13.1, anno other exposures. Using Table 13.2, calculate the stanrviation of the ily change in the portfolio above baseon its exposure to the first two factors. The exposure to one unit of the first factor is 50×(−0.410)−100×(−0.414)=20.950\times(-0.410)-100\times (-0.414)=20.950×(−0.410)−100×(−0.414)=20.9The exposure to one unit of the seconfactor is 50×0.203−100×(−0.193)=29.4550\times0.203-100\times(-0.193)=29.4550×0.203−100×(−0.193)=29.45Using Table 13.2, the stanrviation is14.152×20.92+4.912×29.452=329.19\sqrt{14.15^2\times20.9^2+4.91^2\times29.45^2}=329.1914.152×20.92+4.912×29.452​=329.19 如题

2022-03-15 04:45 1 · 回答

在请问一下老师 Factor loang影响因子变动一个单位,利率的变动幅度 题目的意思是不是50个单位影响因子(Factor scores)的敞口对应5年期利率一个BPS 的变动? Factor scores*Factor loang是个什么单位啊? 为什么可以直接做权重来算protfolio的st?

2020-07-28 00:47 1 · 回答

请教答案中20.9和29.45是怎么来的,谢谢

2020-04-01 22:53 1 · 回答