net.finmath.fouriermethod.calibration.models

Interface CalibratableProcess

All Known Implementing Classes:

CalibratableHestonModel, CalibratableMertonModel

public interface CalibratableProcess

Every class implementing this interface communicates with the calibration routine by providing clones of the model with changed parameters. A model descriptor is stored to infer parameters which are not calibrated such as market observables. We are decorating every characteristic function with the getCloneForModifiedParameters withouth touching the existing classes providing the computation of the characteristic function. Suitable specifications of getCloneForModifiedParameters can be employed to introduce e.g. non-linear constraints. E.g. it is possible to force the Feller condition in the Heston model by providing a suitable implementation of this method.

Author:

Alessandro Gnoatto

Method Summary

Modifier and Type	Method and Description
CharacteristicFunctionModel	getCharacteristicFunctionModel() Directly returns the characteristic function.
CalibratableProcess	getCloneForModifiedParameters(double[] parameters) Calibration substitutes in the model the parameters of the process with calibrated ones.
ModelDescriptor	getModelDescriptor() Every class implementing this interface must contain a ModelDescriptor from which we can create some concrete model.
double[]	getParameterLowerBounds() Extracts parameter lower bounds for the optimizer factory.
double[]	getParameterUpperBounds() Extracts parameter upper bounds for the optimizer factory.

Method Detail

getCloneForModifiedParameters

CalibratableProcess getCloneForModifiedParameters(double[] parameters)

Calibration substitutes in the model the parameters of the process with calibrated ones. Market observables such as the initial stock value should not be changed.

Parameters:

parameters - The new parameters.

Returns:

a clone of the original model with modified parameters.

getModelDescriptor

ModelDescriptor getModelDescriptor()

Every class implementing this interface must contain a ModelDescriptor from which we can create some concrete model.

Returns:

The descriptor for this model.

getCharacteristicFunctionModel

CharacteristicFunctionModel getCharacteristicFunctionModel()

Directly returns the characteristic function.

Returns:

the characteristic function

getParameterLowerBounds

double[] getParameterLowerBounds()

Extracts parameter lower bounds for the optimizer factory.

Returns:

parameter lower bounds for the optimizer factory.

getParameterUpperBounds

double[] getParameterUpperBounds()

Extracts parameter upper bounds for the optimizer factory.

Returns:

parameter upper bounds for the optimizer factory.