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天天 · 2023年07月13日

98%的WCL应该比95.5%的损失24更大才对吧?为什么取了个小数值的24?

NO.PZ2020033002000008

问题如下:

There is a bond portfolio consisted with two bonds. bond A and bond B .The values of bond A and bond B are $60 millions and $40 millions respectively. The one-year probabilities of default and the recovery rate of bond A are 5% and 60% respectively, while for bond B are 7% and 50%. Give an assumption that the probability of joint default is 0.5% and the default correlation is 20%. what is the best estimate of the credit VaR at a 98% confidence level?

选项:

A.

USD 17,400,000

B.

USD 21,400,000

C.

USD 41,400,000

D.

USD 44,000,000

解释:

B is correct.

考点:Credit VaR

解析:

Bond A 违约的损失是60*1-60%=24 million

Bond B违约的损失是40*1-50%=20million

A B同时违约的概率是 0.5%

Bond A 违约但是bond B不违约的概率是 5%-0.5%=4.5%

Bond B违约但是bond A不违约的概率是7%-0.5%=6.5%

根据谨慎性原则 98% confidence WCL=24million

credit VaR=24-2.6=21.4 million

98%的WCL应该比95.5%的损失24更大才对吧?为什么取了个小数值的24?

2 个答案

pzqa27 · 2023年09月11日

嗨,努力学习的PZer你好:


这种题目最好不要倒推,就正着推累积损失,这样也好想。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!

pzqa27 · 2023年07月14日

嗨,从没放弃的小努力你好:


您的算法是有问题的,损失分布是个累积的过程,不是1-4.5%=95.5%就得出了,具体算法如下

当没有损失的时候,发生概率是88.5%(100-7-5+0.5)

然后是当B发生违约时的,累积的概率是88.5%+6.5%=95%

然后是当A发生违约B不违约,累积的概率是95%+4.5%=99.5%,已经超过我们要求的98%,所以WCL根据保守原则选这个

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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!

罗小惠🌟 · 2023年09月09日

能够理解老师这里的思路,就是视频中例题第一个正推累计可能性的思路,但是能不能麻烦老师像何老师一样采用一下倒退的思路讲解一下呢?就是从A和B都违约(也就是最大损失),然后往前推。我自己尝试一下感觉不太能够得到同样的结论。

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