NO.PZ2020011303000146
问题如下:
The mean and standard deviation of a lognormal loss distribution are 100 and 40. What are the mean and variance of the logarithm of the loss?
解释:
In this case w = 0.42 = 0.16, so that the mean and variance of the logarithm of the
题目问:lognormal损失分布的均值和标准差为100和40,求logarithm损失分布的均值和方差是多少?
w = 0.42 = 0.16
均值= ln(100/1.16^0.5) = 4.53
方差=ln(1.16) = 0.148.
这个我们看懂。。。。