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柚柚_柚 · 2020年08月05日

s问一道题:NO.PZ2016082403000021 [ FRM I ]

问题如下:

A European put option has the following characteristics: S0 =$50;X=$45;r=5%;T=1year;andσ=25%. Which of the following is closest to the value of the put?

Use the BSM formula to solve this question.   N(-0.78644)=0.2158, N(-0.74644)=0.2266, N(-0.49644)=0.3085, N(-0.56644)=0.2855

选项:

A.

$1.88.

B.

$3.28.

C.

$9.07.

D.

$10.39.

解释:

A     S0 =$50; X=$45; r=5% T=1year and σ=25% d1=ln(5045)+(0.05+0.06252)10.25(1)=0.186610.25=0.74644{\text{d}}_1=\frac{\ln(\frac{50}{45})+(0.05+\frac{0.0625}2)1}{0.25(1)}=\frac{0.18661}{0.25}=0.74644

d2=0.74644-0.25=0.49644

from the cumulative normal table

N(-d1)=0.2266

N(-d2)=0.3085*

p=45e0.05(1)(0.3085)50(0.2266)=1.88p=45e^{-0.05(1)}(0.3085)-50(0.2266)=1.88

(*note rounding)

请问可以给一下d1和d2公式吗 感觉和书上不太一样
1 个答案
已采纳答案

小刘_品职助教 · 2020年08月05日

同学你好,

公式是一样的,参考讲义就好。