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臧小玉 · 2022年03月09日

图片看不清;累积概率麻烦详细讲解一下

NO.PZ2020033002000084

问题如下:

If two bonds each has a face value of $ 50 million and a one-year cumulative default probability of 2% with zero recovery rate. What is its 99.9% credit var with 99.9% confidence level over the next month, assume they are not correlated?

选项:

A.

$0

B.

$0.168million

C.

$49.832million

D.

$99.832million

解释:

C is correct.

考点:Credit VaR

解析:首先算出来月化的PD也就是0.168%,那么expected loss就等于0.168%*100%*(50+50)million=0.168 million。

然后就要算WCL,两只债券违约的情况如下图:


可以看到50million是第一个累计概率超过99.9%的损失,所以WCL就等于50million。

Credit VaR 就是50million-0.168million=49.832million。

A、B都不违约

A违约

B违约

A、B同时违约

对应概率应该怎么算?

1 个答案

品职答疑小助手雍 · 2022年03月09日

同学你好,本题中两个债券是假设了类似的,不用区分AB。所以只有三种情况就是0个违约,1个违约和2个违约。

按你说的对应到表格里就是:AB都不违约是表格里“都不违约”那一行,A违约(同时B不违约)和B违约(同时A不违约)合起来就是“1只违约”那一行,AB都违约就是“2只违约”那一行。

表格里对应的概率计算的式子也写的挺明确的,如果有哪个符号的意思不明白可以再提问。

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