问题如下:
Continuing with the previous question, what is the best estimate of the unexpected credit loss (away from the ECL), or credit VAR, for this portfolio?
选项:
A.USD 570,000
B.USD 400,000
C.USD 360,000
D.USD 370,000
解释:
ANSWER: D
Here, the joint default probability matters. If the two bonds default, the loss is. This will happen with probability 1.27%. The next biggest loss is $400,000, which has probability of . Its cumulative probability must be . This is slightly above 98%, so $400,000 is the quantile at the 98% level of confidence or higher. Subtracting the mean gives $370,000.
按照书本的例子,两个债券同时违约的概率是1.27%,第一大违约金额是760000,P(违约金额>=760000)=1.27%,第二大违约金额是一个违约一个不违约,违约金额是400000,违约概率是1.73%,那么向上累加,P(违约金额>400000)=1.27%+1.73%=3%,所以98%的置信水平应该是处于400000和760000直接,按照谨慎性原则取760000.为什么这题的解释是直接取400000呢?