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RyanR · 2023年02月28日

用金融计算器应该怎么计算

NO.PZ2020021204000016

问题如下:

The six-month, 12-month, 18-month, and 24-month zero rates are 5%, 5.5%, 6%, and 6.5% (all measured with semi-annual compounding) respectively. What is the two-year par yield for a bond paying coupons every six months?

选项:

解释:

The par yield is the coupon rate c satisfying

c/21+0.05/2+c/2(1+0.055/2)2+c/2(1+0.06/2)3+100+c/2(1+0.065/2)4=100\frac{c/2}{1+0.05/2}+\frac{c/2}{{(1+0.055/2)}^2}+\frac{c/2}{{(1+0.06/2)}^3}+\frac{100+c/2}{{(1+0.065/2)}^4}=100

It is 6.46%. Alternatively, we can use Equation (cm)A  +  100d  =  100\left(\frac cm\right)A\;+\;100d\;=\;100. In

this case m= 2, d= 0.8799, and A= 3.7179.


想请教一下 这个公式考试的时候用计算器应该怎么按出来呀

1 个答案

李坏_品职助教 · 2023年02月28日

嗨,爱思考的PZer你好:


这个用texas计算器算不出来的,因为这里是反求的coupon rate,只能用讲义下面的公式来求:

c = (100 - 100d)m / A。这里A指的是每一期都支付1USD的年金的现值。也就是A = 1/(1+0.05/2) + 1/(1+0.055/2)^2 + 1/(1+0.06/2)^3 + 1/(1+0.065/2)^4 = 3.718

d是在债券到期日收到1USD的现值,所以d = 1/(1+0.065/2)^4 = 0.8799,m是利息支付的频率,题目说了是semi annually,所以m=2.

所以最后的结果就是c = (100-100*0.8799)*2 / 3.718 = 6.46。也就是说par yield应该等于6.46%

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