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天天天儿 · 2022年05月11日

请问天数为什么开根号

  1. CFA III
  2. Fixed Income

* 问题详情，请 查看题干

NO.PZ202112010200002202

问题如下：

What is the approximate VaR for the bond position at a 99% confidence interval (equal to 2.33 standard deviations) for one month (with 21 trading days) if daily yield volatility is 0.015% and returns are normally distributed?

选项：

A.

$1,234,105

B.

$2,468,210

C.

$5,413,133

解释：

A is correct. The expected change in yield based on a 99% confidence interval for the bond and a 0.015% yield volatility over 21 trading days equals 16 bps = (0.015% × 2.33 standard deviations × √21).

We can quantify the bond’s market value change by multiplying the familiar (–ModDur × ∆Yield) expression by bond price to get $1,234,105 = ($75 million × 1.040175 ⨯ (–9.887 × .0016)).

不好意思老师 我的公式记得不是很清楚 能说明一下VaR给出日、月、年sigma下的公式吗？

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1 个答案

pzqa015 · 2022年05月11日

嗨，努力学习的PZer你好：


Var是二级Portfolio的知识点。Var 代表一定概率下，一定时间内的最大亏损。

Var 有daily Var,Monthly Var。以daily Var举例：

5% daily Var=|μdaily-1.65σdaily|

1% daily Var=|μdaily-2.33σdaily|

16%daily Var=|μdaily-σdaily|

如果计算annual Var，σannual=250^1/2*σdaily,μannual=250*μdaily

如果计算monthly Var，σmonthly=21^1/2*σdaily,μmonthly=21*μdaily

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