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缨水珞 · 2021年11月22日

老师你好,想问下这样算哪里算错了?EL1跟答案一样,EL2-EL5都跟答案不一样

NO.PZ2019011002000002

问题如下:

Tim, a credit analyst, is valuing bond B. Bond B is a 5-year corporate bond with a par value of $1000. The bond has a fixed annual coupon rate of 6%, and the coupon is paid annually.

Tim believes that the risk-neutral probability of default (Hazard rate) for each date for the bond is 1.50%, and the recovery rate is 25%. Assume there is no interest rate volatility and the government bond yield curve is flat at 2%.

According to the information above, the fair value of bond B is closet to:

选项:

A.

1083.29

B.

1129.86

C.

1231.29

解释:

B is correct.

考点:考察对Credit risk计量,从而计算Fair value。

解析:

本题按照步骤计算债券价值即可,与上一题的区别是本题的债券每期有Coupon。

第一步:计算每一期的Exposure;第五期的Exposure为1060;

第四期的Exposure,为债券第五年现金流在第四期的现值,加上第四期的Coupon;

即:

60+1060(1+2%)=1099.2260+\frac{1060}{(1+2\%)}=1099.22

第三期的Exposure,为债券第四年,第五年现金流在第三期的现值,加上第三期的Coupon;

即:

60+60(1+2%)+1060(1+2%)2=1137.6660+\frac{60}{(1+2\%)}+\frac{1060}{(1+2\%)^2}=1137.66

依次类推可以计算出每一期的Exposure;计算CVA的步骤和上题一致;有表格:

用2%的无风险利率对该债券进行折现,得到的现值为:1188.538

则可以得到债券的Fair value为:1188.538 - 58.6754 = 1129.86

exposure都算对了,EL=exposure*LGD*pod,为什么算出来EL2-EL5都跟答案不一样?
1 个答案
已采纳答案

吴昊_品职助教 · 2021年11月22日

嗨,爱思考的PZer你好:


关键是你的POD算错了。

第一年的POD就是1.5%,但第二年的POD=(1-1.5%)×1.5%=1.4775%,代表的是第一年不违约的情况下,第二年违约的概率。

同理第三年的POD=(1-1.5%)^2×1.5%=1.4553%,代表的是第一、二年都不违约的情况下,第三年违约的概率。以此类推。


EL2=1175.36×75%×1.4775%=13.0245,EL3=1137.66×75%×1.4553%=12.41727,以此类推。


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虽然现在很辛苦,但努力过的感觉真的很好,加油!

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