am_call_bin_propdiv {AmericanCallOpt}

R Documentation

Binomial price of an American call with an underlying stock that pays proportional dividends

Description

Pricing of an American call stock option that pays proportional dividends

Usage

am_call_bin_propdiv(S, K, r, sigma, t, steps, 
                dividend_times, dividend_yields)

Arguments

S	spot price
K	exercice price
r	interest rate
sigma	volatility
t	time to maturity
steps	number of steps in binomial tree
dividend_times	periods when dividend is paid out
dividend_yields	dividend yields in each period

Details

If the underlying asset is a stock paying dividends during the maturity of the option, the terms of the option are not adjusted to reflect this cash payment, which means that the option value will reflect the dividend payments. In the binomial model, the adjustment for dividends depends on whether the dividends are discrete or proportional. In this R package, we deal with the second case. To address this issue, we multiply the stock prices at the ex-dividend date by an adjustment term. Since the structure of the adjusted payoffs along the binomial tree is standard, we can again compute option price backward starting from the final states.

Value

call_price

Option price

Author(s)

Paolo Zagaglia, paolo.zagaglia@gmail.com

References

John Hull, "Options, Futures and other Derivative Securities", Prentice-Hall, second edition, 1993.

Examples

rm(list=ls())

S<-100 
K<-100
r<-0.10 
sigma<-0.25
t<-1
steps<-100
dividend_times<-matrix(c(0.25, 0.75))
dividend_yields<-matrix(c(0.025, 0.025)) 

call_price_bin_propdiv<-am_call_bin_propdiv(S, K, r, sigma, t, steps,
 dividend_times, dividend_yields)

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