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Asker · 2020年11月07日

问一道题：NO.PZ2016031001000113

  1. CFA I
  2. Fixed Income

问题如下：

An investor buys a three-year bond with a 5% coupon rate paid annually. The bond, with a yield-to-maturity of 3%, is purchased at a price of 105.657223 per 100 of par value. Assuming a 5-basis point change in yield-to-maturity, the bond’s approximate modified duration is closest to:

选项：

A.

2.78.

B.

2.86.

C.

5.56.

解释：

A is correct.

The bond’s approximate modified duration is closest to 2.78. Approximate modified duration is calculated as:

ApproxModDur= [(PV−) − (PV+)] / [2×(ΔYield)×(PV0)]

Lower yield-to-maturity by 5 bps to 2.95%: PV-=105.804232

PV−= 5 / (1+0.0295) + 5/(1+0.0295)^2 + 105/ (1+0.0295)^3 =105.804232

Increase yield-to-maturity by 5 bps to 3.05%: PV+=105.510494

PV+= 5/ (1+0.0305) + 5/ (1+0.0305)^2 + 105/ (1+0.0305)^3 =105.510494

PV0 = 105.657223, ΔYield = 0.0005

modified duration = (105.804232 − 105.510494)/(2×0.0005×105.657223) = 2.78

ApproxModDur=105.804232−105.5104942×0.0005×105.657223=2.78ApproxModDur=\frac{105.804232-105.510494}{2\times0.0005\times105.657223}=2.78


我想问下助教截图里的公式和强化里的公式不太一样

如何从强化串讲的公式来解这个题目呢？

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WallE_品职答疑助手 · 2020年11月08日

您如果对比两个effective duration 其实这两个是一样的。

Approximate modified duration 和effective duration 的区别就在于分母的delta ytm和 delta curve。

YTM是站在自身bond的到期收益率的角度来看的，而curve是站在benchmark rate的改变来看的。

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NO.PZ2016031001000113问题如下investor buys a three-yebonwith a 5% coupon rate paiannually. The bon with a yielto-maturity of 3%, is purchasea priof 105.657223 per 100 of pvalue. Assuming a 5-basis point change in yielto-maturity, the bons approximate mofieration is closest to: A.2.78. B.2.86. C.5.56. A is correct.The bons approximate mofieration is closest to 2.78. Approximate mofieration is calculateas:ApproxMour= [(PV−) − (PV+)] / [2×(ΔYiel×(PV0)]Lower yielto-maturity 5 bps to 2.95%: PV-=105.804232PV−= 5 / (1+0.0295) + 5/(1+0.0295)^2 + 105/ (1+0.0295)^3 =105.804232Increase yielto-maturity 5 bps to 3.05%: PV+=105.510494PV+= 5/ (1+0.0305) + 5/ (1+0.0305)^2 + 105/ (1+0.0305)^3 =105.510494PV0 = 105.657223, ΔYiel= 0.0005mofieration = (105.804232 − 105.510494)/(2×0.0005×105.657223) = 2.78ApproxMour=105.804232−105.5104942×0.0005×105.657223=2.78ApproxMour=\frac{105.804232-105.510494}{2\times0.0005\times105.657223}=2.78ApproxMour=2×0.0005×105.657223105.804232−105.510494​=2.78考点approximate mofieration解析分别算出利率上升5bps后的PV+(105.510494)和利率下降5bps后的PV-(105.804232)，代入approximate mofieration公式即可，故A正确。 老师可以使用计算器进行计算吗，或者有更快地方法进行计算吗

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2020-11-15 16:49 1 · 回答

2.86. 5.56. A is correct. The bons approximate mofieration is closest to 2.78. Approximate mofieration is calculateas: ApproxMour= [(PV−) − (PV+)] / [2×(ΔYiel×(PV0)] Lower yielto-maturity 5 bps to 2.95%: PV-=105.804232 PV−= 5 / (1+0.0295) + 5/(1+0.0295)^2 + 105/ (1+0.0295)^3 =105.804232 Increase yielto-maturity 5 bps to 3.05%: PV+=105.510494 PV+= 5/ (1+0.0305) + 5/ (1+0.0305)^2 + 105/ (1+0.0305)^3 =105.510494 PV0 = 105.657223, ΔYiel= 0.0005 mofieration = (105.804232 − 105.510494)/(2×0.0005×105.657223) = 2.78 ApproxMour=105.804232−105.5104942×0.0005×105.657223=2.78ApproxMour=\frac{105.804232-105.510494}{2\times0.0005\times105.657223}=2.78ApproxMour=2×0.0005×105.657223105.804232−105.510494​=2.78 题目没有交代是不是含权债券，怎么想到是求approximate ration？？课堂讲只有含权债券才用这个方法

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