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506623496 · 2024年07月17日

本题勘误

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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)).

请问本题是做了修正吗?默认0.015% yield volatility是针对y的,不是delta y/y 吗

2 个答案
已采纳答案

pzqa31 · 2024年07月19日

嗨,从没放弃的小努力你好:


是的,是这样的。

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pzqa31 · 2024年07月21日

嗨,爱思考的PZer你好:


是的,这个地方确实有些混乱,以前是yield volatility数据太大,算出来的VaR太大,不符合常识,之前协会出过两个勘误,所以其实主要看yield volatility的数字大小。


第1个是例题勘误,用yield volatility乘以YTM,小于1的YTM乘以Yield volatility之后,就缩小了yield改变,算出来的VaR大小合理。


第2个勘误是课后题勘误,直接缩小了yield volatility,改成了波动是由类似175bp(1.75%)改成了1.75 bps,这个不乘以VaR,因为yield volatility数据小,所以算出拉的VaR也合理。2个方法都在勘误里,视频何老师做了解释。


24年5月10号最新的勘误是把例题里的Yield volatility改小了,这样就也不用乘以YTM,用小的yield volatility算的Var也不大,也符合常理。所以24年考试的话,目前还是按照这个来掌握。


如果是25年考试的话,25年的原版书是重新给了数据,yield volatility是年化数据,要算月度Var,要乘以根号1/12缩小数据,缩小之后不用乘以YTM,算出来的Var大小合适。这个25年的原版书暂时不太适合24年的考试。


相关题目可以看下这个答复,有其他学员把题目给贴出来了https://class.pzacademy.com/qa/161993

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