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Archie · 2022年05月09日

loss

NO.PZ2020011303000126

问题如下:

A USD 1million loan has a probability of 0.5% of defaulting in a year. The recovery rate is estimated to be 40%. What is the expected credit loss and the standard deviation of the credit loss?

解释:

The expected loss in USD is 0.005 × 1 × (1 0.4) = 0.003. This is USD 3,000. The variance of the loss is 0.005 × 0.62 (0.005× 0.6)2 = 0.001791. The standard deviation is the square root of this, or USD 0.04232 million. This is USD 42,320.

E(loss的平方),为啥是lgd×ead哦

1 个答案

李坏_品职助教 · 2022年05月09日

嗨,爱思考的PZer你好:


E(loss^2)其实是:PD×(EAD×LGD)^2,只是这里EAD是1,所以是PD×LGD^2。

方差计算公式如下:

运用到这个题目里可以写成原版书这个公式(loss就是X):

注意看倒数第二个公式:

variance of the credit loss = E(Loss^2) - [E(Loss)]^2 = PD*(EAD*LGD)^2 - (PD*EAD*LGD)^2,这个公式了解一下即可。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!