public SABR(double t, double forward, double alpha, double beta, double nu, double rho,
bool alphaIsFixed, bool betaIsFixed, bool nuIsFixed, bool rhoIsFixed,
bool vegaWeighted = false,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null,
double errorAccept = 0.0020, bool useMaxError = false, int maxGuesses = 50, double shift = 0.0,
VolatilityType volatilityType = VolatilityType.ShiftedLognormal,
SabrApproximationModel approximationModel = SabrApproximationModel.Hagan2002)
{
t_ = t;
forward_ = forward;
alpha_ = alpha;
beta_ = beta;
nu_ = nu;
rho_ = rho;
alphaIsFixed_ = alphaIsFixed;
betaIsFixed_ = betaIsFixed;
nuIsFixed_ = nuIsFixed;
rhoIsFixed_ = rhoIsFixed;
vegaWeighted_ = vegaWeighted;
endCriteria_ = endCriteria;
optMethod_ = optMethod;
errorAccept_ = errorAccept;
useMaxError_ = useMaxError;
maxGuesses_ = maxGuesses;
shift_ = shift;
volatilityType_ = volatilityType;
approximationModel_ = approximationModel;
}
public XABRInterpolationImpl(List <double> xBegin, int size, List <double> yBegin, double t,
double forward, List <double?> _params,
List <bool> paramIsFixed, bool vegaWeighted,
EndCriteria endCriteria,
OptimizationMethod optMethod,
double errorAccept, bool useMaxError, int maxGuesses, List <double?> addParams = null)
: base(xBegin, size, yBegin)
{
// XABRCoeffHolder<Model>(t, forward, params, paramIsFixed),
endCriteria_ = endCriteria;
optMethod_ = optMethod;
errorAccept_ = errorAccept;
useMaxError_ = useMaxError;
maxGuesses_ = maxGuesses;
forward_ = forward;
vegaWeighted_ = vegaWeighted;
// if no optimization method or endCriteria is provided, we provide one
if (optMethod_ == null)
{
optMethod_ = new LevenbergMarquardt(1e-8, 1e-8, 1e-8);
}
if (endCriteria_ == null)
{
endCriteria_ = new EndCriteria(60000, 100, 1e-8, 1e-8, 1e-8);
}
coeff_ = new XABRCoeffHolder <Model>(t, forward, _params, paramIsFixed, addParams);
this.coeff_.weights_ = new InitializedList <double>(size, 1.0 / size);
}
//! Calibrate to a set of market instruments (caps/swaptions)
/*! An additional constraint can be passed which must be
* satisfied in addition to the constraints of the model.
*/
//public void calibrate(List<CalibrationHelper> instruments, OptimizationMethod method, EndCriteria endCriteria,
// Constraint constraint = new Constraint(), List<double> weights = new List<double>()) {
public void calibrate(List <CalibrationHelper> instruments, OptimizationMethod method, EndCriteria endCriteria,
Constraint additionalConstraint, List <double> weights)
{
if (!(weights.Count == 0 || weights.Count == instruments.Count))
{
throw new ApplicationException("mismatch between number of instruments and weights");
}
Constraint c;
if (additionalConstraint.empty())
{
c = constraint_;
}
else
{
c = new CompositeConstraint(constraint_, additionalConstraint);
}
List <double> w = weights.Count == 0 ? new InitializedList <double>(instruments.Count, 1.0): weights;
CalibrationFunction f = new CalibrationFunction(this, instruments, w);
Problem prob = new Problem(f, c, parameters());
shortRateEndCriteria_ = method.minimize(prob, endCriteria);
Vector result = new Vector(prob.currentValue());
setParams(result);
// recheck
Vector shortRateProblemValues_ = prob.values(result);
notifyObservers();
}
public SVI(double t, double forward, double a, double b, double sigma, double rho, double m,
bool aIsFixed, bool bIsFixed, bool sigmaIsFixed, bool rhoIsFixed, bool mIsFixed,
bool vegaWeighted = false,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null,
double errorAccept = 0.0020, bool useMaxError = false, int maxGuesses = 50, List <double?> addParams = null)
{
t_ = t;
forward_ = forward;
a_ = a;
b_ = b;
sigma_ = sigma;
rho_ = rho;
m_ = m;
aIsFixed_ = aIsFixed;
bIsFixed_ = bIsFixed;
sigmaIsFixed_ = sigmaIsFixed;
rhoIsFixed_ = rhoIsFixed;
mIsFixed_ = mIsFixed;
vegaWeighted_ = vegaWeighted;
endCriteria_ = endCriteria;
optMethod_ = optMethod;
errorAccept_ = errorAccept;
useMaxError_ = useMaxError;
maxGuesses_ = maxGuesses;
addParams_ = addParams;
}
public CubicBSplinesFitting(List <double> knots, bool constrainAtZero = true, Vector weights = null,
OptimizationMethod optimizationMethod = null)
: base(constrainAtZero, weights, optimizationMethod)
{
splines_ = new BSpline(3, knots.Count - 5, knots);
Utils.QL_REQUIRE(knots.Count >= 8, () => "At least 8 knots are required");
int basisFunctions = knots.Count - 4;
if (constrainAtZero)
{
size_ = basisFunctions - 1;
// Note: A small but nonzero N_th basis function at t=0 may
// lead to an ill conditioned problem
N_ = 1;
Utils.QL_REQUIRE(Math.Abs(splines_.value(N_, 0.0)) > Const.QL_EPSILON, () =>
"N_th cubic B-spline must be nonzero at t=0");
}
else
{
size_ = basisFunctions;
N_ = 0;
}
}
public NonLinearLeastSquare(Constraint c, double accuracy, int maxiter)
{
exitFlag_ = -1;
accuracy_ = accuracy;
maxIterations_ = maxiter;
om_ = new ConjugateGradient();
c_ = c;
}
public SimplePolynomialFitting(int degree,
bool constrainAtZero = true,
Vector weights = null,
OptimizationMethod optimizationMethod = null)
: base(constrainAtZero, weights, optimizationMethod)
{
size_ = constrainAtZero ? degree : degree + 1;
}
//! Default constructor
public NonLinearLeastSquare(Constraint c, double accuracy, int maxiter, OptimizationMethod om)
{
exitFlag_ = -1;
accuracy_ = accuracy;
maxIterations_ = maxiter;
om_ = om;
c_ = c;
}
//! Calibrate to a set of market instruments (caps/swaptions)
/*! An additional constraint can be passed which must be
* satisfied in addition to the constraints of the model.
*/
//public void calibrate(List<CalibrationHelper> instruments, OptimizationMethod method, EndCriteria endCriteria,
// Constraint constraint = new Constraint(), List<double> weights = new List<double>()) {
public void calibrate(List <CalibrationHelper> instruments,
OptimizationMethod method,
EndCriteria endCriteria,
Constraint additionalConstraint = null,
List <double> weights = null,
List <bool> fixParameters = null)
{
if (weights == null)
{
weights = new List <double>();
}
if (additionalConstraint == null)
{
additionalConstraint = new Constraint();
}
Utils.QL_REQUIRE(weights.empty() || weights.Count == instruments.Count, () =>
"mismatch between number of instruments (" +
instruments.Count + ") and weights(" +
weights.Count + ")");
Constraint c;
if (additionalConstraint.empty())
{
c = constraint_;
}
else
{
c = new CompositeConstraint(constraint_, additionalConstraint);
}
List <double> w = weights.Count == 0 ? new InitializedList <double>(instruments.Count, 1.0): weights;
Vector prms = parameters();
List <bool> all = new InitializedList <bool>(prms.size(), false);
Projection proj = new Projection(prms, fixParameters ?? all);
CalibrationFunction f = new CalibrationFunction(this, instruments, w, proj);
ProjectedConstraint pc = new ProjectedConstraint(c, proj);
Problem prob = new Problem(f, pc, proj.project(prms));
shortRateEndCriteria_ = method.minimize(prob, endCriteria);
Vector result = new Vector(prob.currentValue());
setParams(proj.include(result));
Vector shortRateProblemValues_ = prob.values(result);
notifyObservers();
//CalibrationFunction f = new CalibrationFunction(this, instruments, w);
//Problem prob = new Problem(f, c, parameters());
//shortRateEndCriteria_ = method.minimize(prob, endCriteria);
//Vector result = new Vector(prob.currentValue());
//setParams(result);
//// recheck
//Vector shortRateProblemValues_ = prob.values(result);
//notifyObservers();
}
// to constrained <- from unconstrained
public AbcdCalibration(List <double> t,
List <double> blackVols,
double aGuess = -0.06,
double bGuess = 0.17,
double cGuess = 0.54,
double dGuess = 0.17,
bool aIsFixed = false,
bool bIsFixed = false,
bool cIsFixed = false,
bool dIsFixed = false,
bool vegaWeighted = false,
EndCriteria endCriteria = null,
OptimizationMethod method = null)
{
aIsFixed_ = aIsFixed;
bIsFixed_ = bIsFixed;
cIsFixed_ = cIsFixed;
dIsFixed_ = dIsFixed;
a_ = aGuess;
b_ = bGuess;
c_ = cGuess;
d_ = dGuess;
abcdEndCriteria_ = QLNet.EndCriteria.Type.None;
endCriteria_ = endCriteria;
optMethod_ = method;
weights_ = new InitializedList <double>(blackVols.Count, 1.0 / blackVols.Count);
vegaWeighted_ = vegaWeighted;
times_ = t;
blackVols_ = blackVols;
AbcdMathFunction.validate(aGuess, bGuess, cGuess, dGuess);
Utils.QL_REQUIRE(blackVols.Count == t.Count, () =>
"mismatch between number of times (" + t.Count + ") and blackVols (" + blackVols.Count + ")");
// if no optimization method or endCriteria is provided, we provide one
if (optMethod_ == null)
{
double epsfcn = 1.0e-8;
double xtol = 1.0e-8;
double gtol = 1.0e-8;
bool useCostFunctionsJacobian = false;
optMethod_ = new LevenbergMarquardt(epsfcn, xtol, gtol, useCostFunctionsJacobian);
}
if (endCriteria_ == null)
{
int maxIterations = 10000;
int maxStationaryStateIterations = 1000;
double rootEpsilon = 1.0e-8;
double functionEpsilon = 0.3e-4; // Why 0.3e-4 ?
double gradientNormEpsilon = 0.3e-4; // Why 0.3e-4 ?
endCriteria_ = new EndCriteria(maxIterations, maxStationaryStateIterations, rootEpsilon, functionEpsilon,
gradientNormEpsilon);
}
}
public SwaptionVolCube1x(Handle <SwaptionVolatilityStructure> atmVolStructure,
List <Period> optionTenors,
List <Period> swapTenors,
List <double> strikeSpreads,
List <List <Handle <Quote> > > volSpreads,
SwapIndex swapIndexBase,
SwapIndex shortSwapIndexBase,
bool vegaWeightedSmileFit,
List <List <Handle <Quote> > > parametersGuess,
List <bool> isParameterFixed,
bool isAtmCalibrated,
EndCriteria endCriteria = null,
double?maxErrorTolerance = null,
OptimizationMethod optMethod = null,
double?errorAccept = null,
bool useMaxError = false,
int maxGuesses = 50,
bool backwardFlat = false,
double cutoffStrike = 0.0001)
: base(atmVolStructure, optionTenors, swapTenors, strikeSpreads, volSpreads, swapIndexBase,
shortSwapIndexBase, vegaWeightedSmileFit)
{
parametersGuessQuotes_ = parametersGuess;
isParameterFixed_ = isParameterFixed;
isAtmCalibrated_ = isAtmCalibrated;
endCriteria_ = endCriteria;
optMethod_ = optMethod;
useMaxError_ = useMaxError;
maxGuesses_ = maxGuesses;
backwardFlat_ = backwardFlat;
cutoffStrike_ = cutoffStrike;
if (maxErrorTolerance != null)
{
maxErrorTolerance_ = maxErrorTolerance.Value;
}
else
{
maxErrorTolerance_ = SWAPTIONVOLCUBE_TOL;
if (vegaWeightedSmileFit_)
{
maxErrorTolerance_ = SWAPTIONVOLCUBE_VEGAWEIGHTED_TOL;
}
}
if (errorAccept != null)
{
errorAccept_ = errorAccept.Value;
}
else
{
errorAccept_ = maxErrorTolerance_ / 5.0;
}
privateObserver_ = new PrivateObserver(this);
registerWithParametersGuess();
setParameterGuess();
}
//! constructor
protected FittingMethod(bool constrainAtZero = true,
Vector weights = null,
OptimizationMethod optimizationMethod = null)
{
constrainAtZero_ = constrainAtZero;
weights_ = weights ?? new Vector();
calculateWeights_ = weights_.empty();
optimizationMethod_ = optimizationMethod;
}
// curve optimization called here- adjust optimization parameters here
internal void calculate()
{
FittingCost costFunction = costFunction_;
Constraint constraint = new NoConstraint();
// start with the guess solution, if it exists
Vector x = new Vector(size(), 0.0);
if (!curve_.guessSolution_.empty())
{
x = curve_.guessSolution_;
}
if (curve_.maxEvaluations_ == 0)
{
//Don't calculate, simply use given parameters to provide a fitted curve.
//This turns the fittedbonddiscountcurve into an evaluator of the parametric
//curve, for example allowing to use the parameters for a credit spread curve
//calculated with bonds in one currency to be coupled to a discount curve in
//another currency.
return;
}
//workaround for backwards compatibility
OptimizationMethod optimization = optimizationMethod_;
if (optimization == null)
{
optimization = new Simplex(curve_.simplexLambda_);
}
Problem problem = new Problem(costFunction, constraint, x);
double rootEpsilon = curve_.accuracy_;
double functionEpsilon = curve_.accuracy_;
double gradientNormEpsilon = curve_.accuracy_;
EndCriteria endCriteria = new EndCriteria(curve_.maxEvaluations_,
curve_.maxStationaryStateIterations_,
rootEpsilon,
functionEpsilon,
gradientNormEpsilon);
optimization.minimize(problem, endCriteria);
solution_ = problem.currentValue();
numberOfIterations_ = problem.functionEvaluation();
costValue_ = problem.functionValue();
// save the results as the guess solution, in case of recalculation
curve_.guessSolution_ = solution_;
}
public AbcdInterpolationImpl(List <double> xBegin, int size, List <double> yBegin,
double a, double b, double c, double d,
bool aIsFixed,
bool bIsFixed,
bool cIsFixed,
bool dIsFixed,
bool vegaWeighted,
EndCriteria endCriteria,
OptimizationMethod optMethod)
: base(xBegin, size, yBegin)
{
abcdCoeffHolder_ = new AbcdCoeffHolder(a, b, c, d, aIsFixed, bIsFixed, cIsFixed, dIsFixed);
endCriteria_ = endCriteria;
optMethod_ = optMethod;
vegaWeighted_ = vegaWeighted;
}
public SABRInterpolation(List <double> xBegin, // x = strikes
int xEnd,
List <double> yBegin, // y = volatilities
double t, // option expiry
double forward,
double?alpha,
double?beta,
double?nu,
double?rho,
bool alphaIsFixed,
bool betaIsFixed,
bool nuIsFixed,
bool rhoIsFixed,
bool vegaWeighted = true,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null,
double errorAccept = 0.0020,
bool useMaxError = false,
int maxGuesses = 50,
double shift = 0.0,
VolatilityType volatilityType = VolatilityType.ShiftedLognormal,
SabrApproximationModel approximationModel = SabrApproximationModel.Hagan2002)
{
List <double?> addParams = new List <double?>();
addParams.Add(shift);
addParams.Add(volatilityType == VolatilityType.ShiftedLognormal ? 0.0 : 1.0);
addParams.Add((double?)approximationModel);
impl_ = new XABRInterpolationImpl <SABRSpecs>(
xBegin, xEnd, yBegin, t, forward,
new List <double?>()
{
alpha, beta, nu, rho
},
//boost::assign::list_of(alpha)(beta)(nu)(rho),
new List <bool>()
{
alphaIsFixed, betaIsFixed, nuIsFixed, rhoIsFixed
},
//boost::assign::list_of(alphaIsFixed)(betaIsFixed)(nuIsFixed)(rhoIsFixed),
vegaWeighted, endCriteria, optMethod, errorAccept, useMaxError,
maxGuesses, addParams);
coeffs_ = (impl_ as XABRInterpolationImpl <SABRSpecs>).coeff_;
}
public Abcd(double a, double b, double c, double d,
bool aIsFixed, bool bIsFixed,
bool cIsFixed, bool dIsFixed,
bool vegaWeighted = false,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null)
{
a_ = a;
b_ = b;
c_ = c;
d_ = d;
aIsFixed_ = aIsFixed;
bIsFixed_ = bIsFixed;
cIsFixed_ = cIsFixed;
dIsFixed_ = dIsFixed;
vegaWeighted_ = vegaWeighted;
endCriteria_ = endCriteria;
optMethod_ = optMethod;
}
//! \name Constructors
//@{
//! all market data are quotes
public SviInterpolatedSmileSection(
Date optionDate,
Handle <Quote> forward,
List <double> strikes,
bool hasFloatingStrikes,
Handle <Quote> atmVolatility,
List <Handle <Quote> > volHandles,
double a, double b, double sigma, double rho, double m,
bool isAFixed, bool isBFixed, bool isSigmaFixed, bool isRhoFixed, bool isMFixed,
bool vegaWeighted,
EndCriteria endCriteria = null,
OptimizationMethod method = null,
DayCounter dc = null)
: base(optionDate, dc)
{
forward_ = forward;
atmVolatility_ = atmVolatility;
volHandles_ = volHandles;
strikes_ = strikes;
actualStrikes_ = strikes;
hasFloatingStrikes_ = hasFloatingStrikes;
a_ = a;
b_ = b;
sigma_ = sigma;
rho_ = rho;
m_ = m;
isAFixed_ = isAFixed;
isBFixed_ = isBFixed;
isSigmaFixed_ = isSigmaFixed;
isRhoFixed_ = isRhoFixed;
isMFixed_ = isMFixed;
vegaWeighted_ = vegaWeighted;
endCriteria_ = endCriteria;
method_ = method;
forward_.registerWith(update);
atmVolatility_.registerWith(update);
for (int i = 0; i < volHandles_.Count; ++i)
{
volHandles_[i].registerWith(update);
}
}
//! \name Constructors
//@{
//! all market data are quotes
public SabrInterpolatedSmileSection(
Date optionDate,
Handle <Quote> forward,
List <double> strikes,
bool hasFloatingStrikes,
Handle <Quote> atmVolatility,
List <Handle <Quote> > volHandles,
double alpha, double beta, double nu, double rho,
bool isAlphaFixed, bool isBetaFixed, bool isNuFixed, bool isRhoFixed,
bool vegaWeighted,
EndCriteria endCriteria = null,
OptimizationMethod method = null,
DayCounter dc = null,
double shift = 0.0)
: base(optionDate, dc, null, VolatilityType.ShiftedLognormal, shift)
{
forward_ = forward;
atmVolatility_ = atmVolatility;
volHandles_ = volHandles;
strikes_ = strikes;
actualStrikes_ = strikes;
hasFloatingStrikes_ = hasFloatingStrikes;
alpha_ = alpha;
beta_ = beta;
nu_ = nu;
rho_ = rho;
isAlphaFixed_ = isAlphaFixed;
isBetaFixed_ = isBetaFixed;
isNuFixed_ = isNuFixed;
isRhoFixed_ = isRhoFixed;
vegaWeighted_ = vegaWeighted;
endCriteria_ = endCriteria;
method_ = method;
forward_.registerWith(update);
atmVolatility_.registerWith(update);
for (int i = 0; i < volHandles_.Count; ++i)
{
volHandles_[i].registerWith(update);
}
}
public XABRInterpolationImpl(List <double> xBegin, int size, List <double> yBegin, double t,
double forward, List <double?> _params,
List <bool> paramIsFixed, bool vegaWeighted,
EndCriteria endCriteria,
OptimizationMethod optMethod,
double errorAccept, bool useMaxError, int maxGuesses, List <double?> addParams = null,
XABRConstraint constraint = null)
: base(xBegin, size, yBegin)
{
endCriteria_ = endCriteria ?? new EndCriteria(60000, 100, 1e-8, 1e-8, 1e-8);
optMethod_ = optMethod ?? new LevenbergMarquardt(1e-8, 1e-8, 1e-8);
errorAccept_ = errorAccept;
useMaxError_ = useMaxError;
maxGuesses_ = maxGuesses;
forward_ = forward;
vegaWeighted_ = vegaWeighted;
constraint_ = constraint ?? new NoXABRConstraint();
coeff_ = new XABRCoeffHolder <Model>(t, forward, _params, paramIsFixed, addParams);
coeff_.weights_ = new InitializedList <double>(size, 1.0 / size);
}
/*! Constructor */
public AbcdInterpolation(List <double> xBegin, int size, List <double> yBegin,
double a = -0.06,
double b = 0.17,
double c = 0.54,
double d = 0.17,
bool aIsFixed = false,
bool bIsFixed = false,
bool cIsFixed = false,
bool dIsFixed = false,
bool vegaWeighted = false,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null)
{
impl_ = new AbcdInterpolationImpl(xBegin, size, yBegin,
a, b, c, d,
aIsFixed, bIsFixed,
cIsFixed, dIsFixed,
vegaWeighted,
endCriteria,
optMethod);
impl_.update();
coeffs_ = ((AbcdInterpolationImpl)impl_).AbcdCoeffHolder();
}
public SABRInterpolation(List <double> xBegin, // x = strikes
int xEnd,
List <double> yBegin, // y = volatilities
double t, // option expiry
double forward,
double?alpha,
double?beta,
double?nu,
double?rho,
bool alphaIsFixed,
bool betaIsFixed,
bool nuIsFixed,
bool rhoIsFixed,
bool vegaWeighted = true,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null,
double errorAccept = 0.0020,
bool useMaxError = false,
int maxGuesses = 50)
{
impl_ = new XABRInterpolationImpl <SABRSpecs>(
xBegin, xEnd, yBegin, t, forward,
new List <double?>()
{
alpha, beta, nu, rho
},
//boost::assign::list_of(alpha)(beta)(nu)(rho),
new List <bool>()
{
alphaIsFixed, betaIsFixed, nuIsFixed, rhoIsFixed
},
//boost::assign::list_of(alphaIsFixed)(betaIsFixed)(nuIsFixed)(rhoIsFixed),
vegaWeighted, endCriteria, optMethod, errorAccept, useMaxError,
maxGuesses);
coeffs_ = (impl_ as XABRInterpolationImpl <SABRSpecs>).coeff_;
}
public SABR(double t, double forward, double alpha, double beta, double nu, double rho,
bool alphaIsFixed, bool betaIsFixed, bool nuIsFixed, bool rhoIsFixed,
bool vegaWeighted = false,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null,
double errorAccept = 0.0020, bool useMaxError = false, int maxGuesses = 50)
{
t_ = t;
forward_ = forward;
alpha_ = alpha;
beta_ = beta;
nu_ = nu;
rho_ = rho;
alphaIsFixed_ = alphaIsFixed;
betaIsFixed_ = betaIsFixed;
nuIsFixed_ = nuIsFixed;
rhoIsFixed_ = rhoIsFixed;
vegaWeighted_ = vegaWeighted;
endCriteria_ = endCriteria;
optMethod_ = optMethod;
errorAccept_ = errorAccept;
useMaxError_ = useMaxError;
maxGuesses_ = maxGuesses;
}
public SviInterpolation(List <double> xBegin, // x = strikes
int size,
List <double> yBegin, // y = volatilities
double t, // option expiry
double forward,
double?a,
double?b,
double?sigma,
double?rho,
double?m,
bool aIsFixed,
bool bIsFixed,
bool sigmaIsFixed,
bool rhoIsFixed,
bool mIsFixed, bool vegaWeighted = true,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null,
double errorAccept = 0.0020,
bool useMaxError = false,
int maxGuesses = 50,
List <double?> addParams = null)
{
impl_ = new XABRInterpolationImpl <SVISpecs>(
xBegin, size, yBegin, t, forward,
new List <double?>()
{
a, b, sigma, rho, m
},
new List <bool>()
{
aIsFixed, bIsFixed, sigmaIsFixed, rhoIsFixed, mIsFixed
},
vegaWeighted, endCriteria, optMethod, errorAccept, useMaxError,
maxGuesses, addParams);
coeffs_ = (impl_ as XABRInterpolationImpl <SVISpecs>).coeff_;
}
public SvenssonFitting(Vector weights = null, OptimizationMethod optimizationMethod = null)
: base(true, weights, optimizationMethod)
{
}
public ExponentialSplinesFitting(bool constrainAtZero = true,
Vector weights = null,
OptimizationMethod optimizationMethod = null)
: base(constrainAtZero, weights, optimizationMethod)
{
}
//! Calibrate to a set of market instruments (caps/swaptions)
/*! An additional constraint can be passed which must be
satisfied in addition to the constraints of the model.
*/
//public void calibrate(List<CalibrationHelper> instruments, OptimizationMethod method, EndCriteria endCriteria,
// Constraint constraint = new Constraint(), List<double> weights = new List<double>()) {
public void calibrate(List<CalibrationHelper> instruments, OptimizationMethod method, EndCriteria endCriteria,
Constraint additionalConstraint, List<double> weights)
{
if (!(weights.Count == 0 || weights.Count == instruments.Count))
throw new ApplicationException("mismatch between number of instruments and weights");
Constraint c;
if (additionalConstraint.empty())
c = constraint_;
else
c = new CompositeConstraint(constraint_,additionalConstraint);
List<double> w = weights.Count == 0 ? new InitializedList<double>(instruments.Count, 1.0): weights;
CalibrationFunction f = new CalibrationFunction(this, instruments, w);
Problem prob = new Problem(f, c, parameters());
shortRateEndCriteria_ = method.minimize(prob, endCriteria);
Vector result = new Vector(prob.currentValue());
setParams(result);
// recheck
Vector shortRateProblemValues_ = prob.values(result);
notifyObservers();
}
public NelsonSiegelFitting(Vector weights = null, OptimizationMethod optimizationMethod = null)
: base(true, weights, optimizationMethod)
{
}
public SwaptionVolCube1x(Handle <SwaptionVolatilityStructure> atmVolStructure,
List <Period> optionTenors,
List <Period> swapTenors,
List <double> strikeSpreads,
List <List <Handle <Quote> > > volSpreads,
SwapIndex swapIndexBase,
SwapIndex shortSwapIndexBase,
bool vegaWeightedSmileFit,
List <List <Handle <Quote> > > parametersGuess,
List <bool> isParameterFixed,
bool isAtmCalibrated,
EndCriteria endCriteria = null,
double?maxErrorTolerance = null,
OptimizationMethod optMethod = null,
double?errorAccept = null,
bool useMaxError = false,
int maxGuesses = 50,
bool backwardFlat = false,
double cutoffStrike = 0.0001)
: base(atmVolStructure, optionTenors, swapTenors, strikeSpreads, volSpreads, swapIndexBase,
shortSwapIndexBase, vegaWeightedSmileFit)
{
parametersGuessQuotes_ = parametersGuess;
isParameterFixed_ = isParameterFixed;
isAtmCalibrated_ = isAtmCalibrated;
endCriteria_ = endCriteria;
optMethod_ = optMethod;
useMaxError_ = useMaxError;
maxGuesses_ = maxGuesses;
backwardFlat_ = backwardFlat;
cutoffStrike_ = cutoffStrike;
// the current implementations are all lognormal, if we have
// a normal one, we can move this check to the implementing classes
Utils.QL_REQUIRE(atmVolStructure.link.volatilityType() == VolatilityType.ShiftedLognormal, () =>
"vol cubes of type 1 require a lognormal atm surface");
if (maxErrorTolerance != null)
{
maxErrorTolerance_ = maxErrorTolerance.Value;
}
else
{
maxErrorTolerance_ = SWAPTIONVOLCUBE_TOL;
if (vegaWeightedSmileFit_)
{
maxErrorTolerance_ = SWAPTIONVOLCUBE_VEGAWEIGHTED_TOL;
}
}
if (errorAccept != null)
{
errorAccept_ = errorAccept.Value;
}
else
{
errorAccept_ = maxErrorTolerance_ / 5.0;
}
privateObserver_ = new PrivateObserver(this);
registerWithParametersGuess();
setParameterGuess();
}
public NonLinearLeastSquare(Constraint c, double accuracy, int maxiter)
{
exitFlag_ = -1;
accuracy_ = accuracy;
maxIterations_ = maxiter;
om_ = new ConjugateGradient();
c_ = c;
}
//! Default constructor
public NonLinearLeastSquare(Constraint c, double accuracy, int maxiter, OptimizationMethod om)
{
exitFlag_ = -1;
accuracy_ = accuracy;
maxIterations_ = maxiter;
om_ = om;
c_ = c;
}
public SABR(double t, double forward, double alpha, double beta, double nu, double rho,
bool alphaIsFixed, bool betaIsFixed, bool nuIsFixed, bool rhoIsFixed,
bool vegaWeighted = false,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null,
double errorAccept = 0.0020, bool useMaxError = false,int maxGuesses = 50)
{
t_ = t;
forward_ = forward;
alpha_ = alpha;
beta_ = beta;
nu_ = nu;
rho_ = rho;
alphaIsFixed_ = alphaIsFixed;
betaIsFixed_ = betaIsFixed;
nuIsFixed_ = nuIsFixed;
rhoIsFixed_ = rhoIsFixed;
vegaWeighted_ = vegaWeighted;
endCriteria_ = endCriteria;
optMethod_ = optMethod;
errorAccept_ = errorAccept;
useMaxError_ = useMaxError;
maxGuesses_ = maxGuesses;
}
public SABRInterpolation( List<double> xBegin, // x = strikes
int xEnd,
List<double> yBegin, // y = volatilities
double t, // option expiry
double forward,
double? alpha,
double? beta,
double? nu,
double? rho,
bool alphaIsFixed,
bool betaIsFixed,
bool nuIsFixed,
bool rhoIsFixed,
bool vegaWeighted = true,
EndCriteria endCriteria = null,
OptimizationMethod optMethod = null,
double errorAccept = 0.0020,
bool useMaxError = false,
int maxGuesses = 50 )
{
impl_ = new XABRInterpolationImpl<SABRSpecs>(
xBegin, xEnd, yBegin, t, forward,
new List<double?>(){alpha,beta,nu,rho},
//boost::assign::list_of(alpha)(beta)(nu)(rho),
new List<bool>(){alphaIsFixed,betaIsFixed,nuIsFixed,rhoIsFixed},
//boost::assign::list_of(alphaIsFixed)(betaIsFixed)(nuIsFixed)(rhoIsFixed),
vegaWeighted, endCriteria, optMethod, errorAccept, useMaxError,
maxGuesses);
coeffs_ = (impl_ as XABRInterpolationImpl<SABRSpecs>).coeff_;
}