问题如下:
A portfolio consists of two bonds. The credit VAR is defined as the maximum loss due to defaults at a confidence level of 98% over a one-year horizon. The probability of joint default of the two bonds is 1.27%, and the default correlation is 30%. The bond value, default probability, and recovery rate are USD 1,000,000, 3%, and 60% for one bond, and USD 600,000, 5%, and 40% for the other. 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 3.00%-1.27%=1.73%
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.
The next biggest loss is $400,000, which has probability of 3.00%-1.27%=1.73%
请问为什么概率不是3%*(1-5%)=2.85%