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ZF Everyday · 2022年07月28日

AI计息周期问题

NO.PZ2019010402000057

问题如下:

Aries is going to purchase a two-year Treasury note futures contract, The underlying 1.2%, semi-annual two-year Treasury note is quoted at a clean price of 103. It has been 60 days since the last coupon payment. Aries wants to calculate the full spot price of the underlying two-year Treasury note:

选项:

A.

103.60

B.

103.20

C.

102.80

解释:

B is correct

本题考察的是计算一个两年期国库券的价格。

S0 = Quoted bond price + Accrued interest = B0 + AI0

Accrued interest ( AI )= Accrural period × Periodic coupon amount = NAD/NTD× C/n

AI = (60/180) × (0.012*100/2) = 0.20.

S0 = 103 + 0.20 = 103.20

老师,答案是AI = (60/180) × (0.012*100/2),我自己想的是=60/360*1.2%*100,能否这样计算呢?虽然半年付息,但是60天除以360,是对应年化1.2%的。

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已采纳答案

Lucky_品职助教 · 2022年07月31日

嗨,从没放弃的小努力你好:


你的思考方式没问题,只是按照AI的定义,我们用Accrual period即(60/180), Periodic coupon amount 即去年化的按照付息频率计算的期间的coupon,你按照你的方式计算也可以

Accrued interest ( AI )= Accrual period × Periodic coupon amount 

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加油吧,让我们一起遇见更好的自己!

ZF Everyday · 2022年07月31日

老师如果是季度付息,我这个公式应该还是60÷360*0.012*100,不会除以720呀。 咱们这个公式就是0.012÷4×100×60÷90。 这计算出来还是一样的。 老师,我不是较真儿哈,我就想知道我这个思维方式是不是有问题?但又不是很清晰的知道错在哪里。能否举个例子?

Lucky_品职助教 · 2022年07月31日

嗨,爱思考的PZer你好:


你这样计算也是可以的~但只是半年付息的数比较凑巧,如果是每季度付息,你的公式计算就要60/720,很容易算错。

我们一般先按照付息频率算出coupon,比如每半年付息就是(0.012*100/2),再去年化就是*(60/180),这样比较好理解,且不容易出错

----------------------------------------------
加油吧,让我们一起遇见更好的自己!

ZF Everyday · 2022年07月31日

老师如果是季度付息,我这个公式应该还是60÷360*0.012*100,不会除以720呀。 咱们这个公式就是0.012÷4×100×60÷90。 这计算出来还是一样的。 老师,我不是较真儿哈,我就想知道我这个思维方式是不是有问题?但又不是很清晰的知道错在哪里。能否举个例子?

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