optstockbybaw
Calculate American options prices using Barone-Adesi and Whaley option pricing model
Description
Examples
Compute American Option Prices Using the Barone-Adesi and Whaley Option Pricing Model
Consider an American call option with an exercise price of $120. The option expires on Jan 1, 2018. The stock has a volatility of 14% per annum, and the annualized continuously compounded risk-free rate is 4% per annum as of Jan 1, 2016. Using this data, calculate the price of the American call, assuming the price of the stock is $125 and pays a dividend of 2%.
StartDate = datetime(2016,1,1); EndDate = datetime(2018,1,1); Basis = 1; Compounding = -1; Rates = 0.04;
Define the RateSpec
.
RateSpec = intenvset('ValuationDate',StartDate,'StartDate',StartDate,'EndDate',EndDate, ... 'Rates',Rates,'Basis',Basis,'Compounding',Compounding)
RateSpec = struct with fields:
FinObj: 'RateSpec'
Compounding: -1
Disc: 0.9231
Rates: 0.0400
EndTimes: 2
StartTimes: 0
EndDates: 737061
StartDates: 736330
ValuationDate: 736330
Basis: 1
EndMonthRule: 1
Define the StockSpec
.
Dividend = 0.02;
AssetPrice = 125;
Volatility = 0.14;
StockSpec = stockspec(Volatility,AssetPrice,'Continuous',Dividend)
StockSpec = struct with fields:
FinObj: 'StockSpec'
Sigma: 0.1400
AssetPrice: 125
DividendType: {'continuous'}
DividendAmounts: 0.0200
ExDividendDates: []
Define the American option.
OptSpec = 'call';
Strike = 120;
Settle = datetime(2016,1,1);
Maturity = datetime(2018,1,1);
Compute the price for the American option.
Price = optstockbybaw(RateSpec,StockSpec,Settle,Maturity,OptSpec,Strike)
Price = 14.5180
Input Arguments
StockSpec
— Stock specification for underlying asset
structure
Stock specification for the underlying asset. For information
on the stock specification, see stockspec
.
stockspec
handles several
types of underlying assets. For example, for physical commodities
the price is StockSpec.Asset
, the volatility is StockSpec.Sigma
,
and the convenience yield is StockSpec.DividendAmounts
.
Data Types: struct
Settle
— Settlement date
datetime array | string array | date character vector
Settlement date for the American option, specified as a
NINST
-by-1
vector using a datetime
array, string array, or date character vectors.
To support existing code, optstockbybaw
also
accepts serial date numbers as inputs, but they are not recommended.
Maturity
— Maturity date
datetime array | string array | date character vector
Maturity date for the American option, specified as a
NINST
-by-1
vector using a datetime
array, string array, or date character vectors.
To support existing code, optstockbybaw
also
accepts serial date numbers as inputs, but they are not recommended.
OptSpec
— Definition of option
character vector with values 'call'
or
'put'
| cell array of character vectors with values 'call'
or
'put'
| string array with values 'call'
or
'put'
Definition of the option as 'call'
or 'put'
, specified
as a NINST
-by-1
cell array of character vectors
or string arrays with values 'call'
or
'put'
.
Data Types: char
| cell
| string
Strike
— American option strike price value
nonnegative scalar | nonnegative vector
American Option strike price value, specified as a nonnegative
scalar or NINST
-by-1
matrix
of strike price values. Each row is the schedule for one option.
Data Types: single
| double
Output Arguments
Price
— Expected prices for American options
vector
Expected prices for American options, returned as a
NINST
-by-1
vector.
More About
Vanilla Option
A vanilla option is a category of options that includes only the most standard components.
A vanilla option has an expiration date and straightforward strike price. American-style options and European-style options are both categorized as vanilla options.
The payoff for a vanilla option is as follows:
For a call:
For a put:
where:
St is the price of the underlying asset at time t.
K is the strike price.
For more information, see Vanilla Option.
References
[1] Barone-Aclesi, G. and Robert E. Whaley. “Efficient Analytic Approximation of American Option Values.” The Journal of Finance. Volume 42, Issue 2 (June 1987), 301–320.
[2] Haug, E. The Complete Guide to Option Pricing Formulas. Second Edition. McGraw-Hill Education, January 2007.
Version History
Introduced in R2017aR2022b: Serial date numbers not recommended
Although optstockbybaw
supports serial date numbers,
datetime
values are recommended instead. The
datetime
data type provides flexible date and time
formats, storage out to nanosecond precision, and properties to account for time
zones and daylight saving time.
To convert serial date numbers or text to datetime
values, use the datetime
function. For example:
t = datetime(738427.656845093,"ConvertFrom","datenum"); y = year(t)
y = 2021
There are no plans to remove support for serial date number inputs.
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