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上小学 · 2023年10月03日

请问此题中解题是什么意思?基于审慎原则应该选4000万最大损失呀?损失越大越审慎。

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

另外,一个发生违约另一个不违约概率是怎么求的?在不独立的情况下。谢谢

3 个答案
已采纳答案

DD仔_品职助教 · 2023年10月06日

嗨,从没放弃的小努力你好:


24m涵盖的就是94.8%到99.3%的区间,44m涵盖的是99.3%到100%的区间,98%是在24m的区间内

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努力的时光都是限量版,加油!

frm二级过过过! · 2023年11月04日

为什么44m是99.3%到100%的区间,不应该是99.5%到100%吗?

DD仔_品职助教 · 2023年11月05日

嗨,努力学习的PZer你好:


44m的区间是99.5%到100%,两个一起违约的概率是0.5%。

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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!

CeciliaDD · 2024年05月10日

看到这句话突然理解了

DD仔_品职助教 · 2023年10月03日

嗨,努力学习的PZer你好:


同学你好,

问题1:40m不是损失,是value,我们要根据value和LGD以及PD求loss

问题2:请看下图

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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!

上小学 · 2023年10月04日

谢谢您对概率的解释非常清楚,关于损失,在二者都违约时,损失不是4400万吗?概率是百分之0.5,也就是99.5分位点,正符合审慎原则,肯定比98分位点大。而2400万,分位点比98小了,不审慎啊。我一直听不懂为什么审慎不是选个大的,讲义那块也一直看不懂。到底怎么算审慎呢?选损失大的还是小的?谢谢

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