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Build Equal Probabilities stock tree



EQPTree = eqptree(StockSpec,RateSpec,TimeSpec) builds an Equal Probabilities stock tree.


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Using the data provided, create a stock specification (StockSpec), rate specification (RateSpec), and tree time layout specification (TimeSpec). Then use these specifications to create an EQP stock tree with eqptree.

Sigma = 0.20;
AssetPrice = 50;
DividendType = 'cash';
DividendAmounts = [0.50; 0.50; 0.50; 0.50];
ExDividendDates = {'03-Jan-2003'; '01-Apr-2003'; '05-July-2003'; 

StockSpec = stockspec(Sigma, AssetPrice, DividendType, ... 
DividendAmounts, ExDividendDates);

RateSpec = intenvset('Rates', 0.05, 'StartDates',... 
'01-Jan-2003', 'EndDates', '31-Dec-2003');

ValuationDate = '1-Jan-2003';
Maturity = '31-Dec-2003';
TimeSpec = eqptimespec(ValuationDate, Maturity, 4);

EQPTree = eqptree(StockSpec, RateSpec, TimeSpec)
Warning: RateSpec was not created with continuous compounding. Compounding will
be set to continuous while leaving discount factors unaltered. This will result
in the recalculation of the interest rates. 

EQPTree = 

  struct with fields:

       FinObj: 'BinStockTree'
       Method: 'EQP'
    StockSpec: [1×1 struct]
     TimeSpec: [1×1 struct]
     RateSpec: [1×1 struct]
         tObs: [0 0.2493 0.4986 0.7479 0.9972]
         dObs: [731582 731673 731764 731855 731946]
        STree: {1×5 cell}
      UpProbs: [0.5000 0.5000 0.5000 0.5000]]

Use treeviewer to observe the tree you have created.

Input Arguments

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Stock specification, specified by the StockSpec obtained from stockspec. See stockspec for information on creating a stock specification.

Data Types: struct

Interest-rate specification for initial risk-free rate curve, specified by the RateSpec obtained from intenvset. For information on the interest-rate specification, see intenvset.


The standard equal probabilities tree assumes a constant interest rate, but RateSpec allows you to specify an interest-rate curve with varying rates. If you specify variable interest rates, the resulting tree is not a standard equal probabilities tree.

Data Types: struct

Tree time layout specification, specified by the TimeSpec obtained from eqptimespec. The TimeSpec defines the observation dates of the EQP stock tree. See eqptimespec for information on the tree structure.

Data Types: struct

Output Arguments

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EQP stock tree, returned as a structure specifying the time layout for the tree.

Version History

Introduced before R2006a