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Binomial Model: Let's price with it ! ( The Revenge 2)
Issued on October 02 2010 par Strategies-options.com

Odd or even ? Parity of the number of periods is of a great importance in estimating option value using the binomial model!
I - A Very First Approximation

The very first approximation we got were 14.1334 with 30 periods, for a 1 year call struck at 100, riskfree rate at 5%, volatility at 30%.
Black & Scholes fair value is about 14.2312. Binomial model for 30 periods is lower than true value


With 31 periods, the outcome would be 14.3201, slightly above the true value.




- With 100 periods, call value is 14.2018,
- With 101 periods it would be 14.2584.



II - The facts

The more the periods the more accurate the approximation.
With even numbers, approximation is always above the true value.
With odd numbers, approximation is always below the true value.



III - A simple way to be much more accurate

Run a first approximations done with n periods
Run a second approximation with n+1 periods
Take the mean of the both outcomes.

With 30 periods call price was 14.1334, with 31 periods the call price was 14.3201.
The mean is (14.1334+14.3201)/2=(28.4535)/2=14.2267, much more accurate than Black & Scholes value.
With 100 and 101 periods it leads to =(14.2018+14.2584)/2=14.2301 closer from 14.2312.



IV - Purpose

Even with 10 and 11 periods it leads to (13.9407+14.4831)/2=14.2119, a better one than with 100 periods.



Next :Binomial Model : The Tree
Previous : Binomial Model : Let's Price With It !


Related Pdf :

- BINOMIAL MODEL


OPTIONS PRICING MODEL - INDEX
OPTIONS PRICING MODEL - INDEX
OPTIONS PRICING MODEL - CHAPTER I
OPTIONS PRICING MODEL - CHAPTER II
OPTIONS PRICING MODEL - CHAPTER III

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