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zjcjrd · 2020年03月05日

问一道题:NO.PZ2016082406000017 [ FRM II ]

问题如下:

Company ABC was incorporated on January 1, 2004. It has an expected annual default rate of 10%. Assuming a constant quarterly default rate, what is the probability that company ABC will not have defaulted by April 1, 2004?

选项:

A.

2.40%

B.

2.50%

C.

97.40%

D.

97.50%

解释:

ANSWER: C

The probability of survival for one year is S=(1d)=(1dQ)4S=(1-d)={(1-d^Q)}^4. This gives a probability of surviving the first quarter of (1dQ)=(10.10)14=0.974(1-d^Q)={(1-0.10)}^\frac14=0.974.

这题题目为什么不能用d的四次方等于10%算
1 个答案

品职答疑小助手雍 · 2020年03月05日

同学你好,因为用survival rate算得到的是连续XX期限存活下来的概率,但是你用违约的概率算,算出来的是“连续XX期违约的概率”,违约只会出现一次,然后就没有然后了所以不能这么算。