NO.PZ2020033003000035
问题如下:
Assume an investor has a credit position that has a market factor sensitivity of 0.4 and the
default threshold is at the 95% confidence level. According to the information above, what is
the realized market value used to reach this threshold
?
选项:
A.-0.257.
B.-0.379.
C.-0.512.
D.-0.658.
解释:
B is correct.
考点: Single Factor Model
解析:95%对应的confidence level也就是5%的default loss level在标准正态分布里对应-1.645。
通过单因素模型: -1.645=\frac{-1.645-0.4\times m}{\sqrt{1-0.4^2}}
可以解出m是-0.658。
基础班讲的99%用的是-2.33 这个值应该是双尾的吧。那95%应该用1.96吧,为什么答案用的1.65呢,而且答案跟选项不符哦,我看上面有小伙伴提出来,但是还没改过来呐~ 用1.96算出来是0.4几没有选项呢