barrierbyitt

Price barrier options using implied trinomial tree (ITT)

Syntax

[Price, PriceTree] = barrierbyitt(ITTTree, OptSpec, Strike,
ExerciseDates, AmericanOpt, BarrierSpec, Barrier, Rebate,
Options)

Arguments

ITTTree

Stock tree structure created by itttree.

OptSpec

NINST-by-1 list of string values 'Call' or 'Put'.

Strike

European and American option, NINST-by-1 vector of strike price values. Each row is the schedule for one option.

Settle

NINST-by-1 vector of Settle dates. The settle date for every barrier option is set to the valuation date of the stock tree. The barrier argument Settle is ignored.

ExerciseDates

For a European option (AmericanOpt = 0):

NINST-by-1 vector of exercise dates. Each row is the schedule for one option. For a European option, there is only one exercise date, the option expiry date.

For an American option (AmericanOpt = 1):

NINST-by-2 vector of exercise date boundaries. For each instrument, the option can be exercised on any tree date between or including the pair of dates on that row. If only one non-NaN date is listed, or if ExerciseDates is NINST-by-1, the option can be exercised between the valuation date of the stock tree and the single listed exercise date.

AmericanOpt

If AmericanOpt = 0, NaN, or is unspecified, the option is a European option. If AmericanOpt = 1, the option is an American option.

BarrierSpec

List of string values:

'UI': Up Knock In

'UO': Up Knock Out

'DI': Down Knock In

'DO': Down Knock Out

Barrier

Vector of barrier values.

Rebate

(Optional) NINST-by-1 matrix of rebate values. Default = 0. For Knock In options, the rebate is paid at expiry. For Knock Out options, the rebate is paid when the barrier is reached.

Options

(Optional) Derivatives pricing options structure created with derivset.

See instbarrier for a description of barrier contract arguments.

Description

[Price, PriceTree] = barrierbyitt(ITTTree, OptSpec, Strike,
ExerciseDates, AmericanOpt, BarrierSpec, Barrier, Rebate,
Options)
computes the price of barrier options using an implied trinomial tree.

Price is a NINST-by-1 vector of expected prices at time 0.

PriceTree is a tree structure with a vector of instrument prices at each node.

    Note:   The Settle date for every barrier option is set to the ValuationDate of the stock tree. The barrier argument, Settle, is ignored.

Examples

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Price a Barrier Option Using an ITT Tree

This example shows how to price a barrier option using an ITT tree by loading the file deriv.mat, which provides ITTTree. The ITTTree structure contains the stock specification and time information needed to price the option.

load deriv.mat;

OptSpec = 'Call';
Strike =  85;
Settle = '01-Jan-2006';
ExerciseDates = '31-Dec-2008';
AmericanOpt = 1;
BarrierSpec = 'UI';
Barrier =  115;

Price = barrierbyitt(ITTTree,OptSpec,Strike,Settle,ExerciseDates,AmericanOpt,...
BarrierSpec,Barrier)
Price =

    2.4074

References

Derman, E., I. Kani, D. Ergener, and I. Bardhan, "Enhanced Numerical Methods for Options with Barriers," Financial Analysts Journal, Nov.-Dec.,1995.

See Also

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