QuantLib
: a free/open-source library for quantitative finance
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ql
math
distributions
chisquaredistribution.hpp
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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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Copyright (C) 2002, 2003 Sadruddin Rejeb
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Copyright (C) 2007 Klaus Spanderen
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This file is part of QuantLib, a free-software/open-source library
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for financial quantitative analysts and developers - http://quantlib.org/
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QuantLib is free software: you can redistribute it and/or modify it
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under the terms of the QuantLib license. You should have received a
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copy of the license along with this program; if not, please email
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<quantlib-dev@lists.sf.net>. The license is also available online at
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<http://quantlib.org/license.shtml>.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the license for more details.
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*/
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/*! \file chisquaredistribution.hpp
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\brief Chi-square (central and non-central) distributions
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*/
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#ifndef quantlib_chi_square_distribution_hpp
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#define quantlib_chi_square_distribution_hpp
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#include <
ql/types.hpp
>
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#include <functional>
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namespace
QuantLib
{
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class
CumulativeChiSquareDistribution
{
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public
:
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explicit
CumulativeChiSquareDistribution
(
Real
df) :
df_
(df) {}
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Real
operator()
(
Real
x)
const
;
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private
:
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Real
df_
;
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};
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class
NonCentralCumulativeChiSquareDistribution
{
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public
:
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NonCentralCumulativeChiSquareDistribution
(
Real
df,
Real
ncp)
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:
df_
(df),
ncp_
(ncp) {}
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Real
operator()
(
Real
x)
const
;
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private
:
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Real
df_
,
ncp_
;
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};
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class
NonCentralCumulativeChiSquareSankaranApprox
{
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public
:
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NonCentralCumulativeChiSquareSankaranApprox
(
Real
df,
Real
ncp)
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:
df_
(df),
ncp_
(ncp) {}
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Real
operator()
(
Real
x)
const
;
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private
:
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Real
df_
,
ncp_
;
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};
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class
InverseNonCentralCumulativeChiSquareDistribution
{
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public
:
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InverseNonCentralCumulativeChiSquareDistribution
(
Real
df,
Real
ncp,
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Size
maxEvaluations=10,
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Real
accuracy = 1e-8);
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Real
operator()
(
Real
x)
const
;
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private
:
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NonCentralCumulativeChiSquareDistribution
nonCentralDist_
;
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const
Real
guess_
;
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const
Size
maxEvaluations_
;
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const
Real
accuracy_
;
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};
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}
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#endif
QuantLib::CumulativeChiSquareDistribution
Definition:
chisquaredistribution.hpp:33
QuantLib::CumulativeChiSquareDistribution::operator()
Real operator()(Real x) const
Definition:
chisquaredistribution.cpp:29
QuantLib::CumulativeChiSquareDistribution::CumulativeChiSquareDistribution
CumulativeChiSquareDistribution(Real df)
Definition:
chisquaredistribution.hpp:35
QuantLib::CumulativeChiSquareDistribution::df_
Real df_
Definition:
chisquaredistribution.hpp:38
QuantLib::InverseNonCentralCumulativeChiSquareDistribution
Definition:
chisquaredistribution.hpp:59
QuantLib::InverseNonCentralCumulativeChiSquareDistribution::maxEvaluations_
const Size maxEvaluations_
Definition:
chisquaredistribution.hpp:69
QuantLib::InverseNonCentralCumulativeChiSquareDistribution::operator()
Real operator()(Real x) const
Definition:
chisquaredistribution.cpp:115
QuantLib::InverseNonCentralCumulativeChiSquareDistribution::nonCentralDist_
NonCentralCumulativeChiSquareDistribution nonCentralDist_
Definition:
chisquaredistribution.hpp:67
QuantLib::InverseNonCentralCumulativeChiSquareDistribution::guess_
const Real guess_
Definition:
chisquaredistribution.hpp:68
QuantLib::InverseNonCentralCumulativeChiSquareDistribution::accuracy_
const Real accuracy_
Definition:
chisquaredistribution.hpp:70
QuantLib::NonCentralCumulativeChiSquareDistribution
Definition:
chisquaredistribution.hpp:41
QuantLib::NonCentralCumulativeChiSquareDistribution::operator()
Real operator()(Real x) const
Definition:
chisquaredistribution.cpp:33
QuantLib::NonCentralCumulativeChiSquareDistribution::ncp_
Real ncp_
Definition:
chisquaredistribution.hpp:47
QuantLib::NonCentralCumulativeChiSquareDistribution::NonCentralCumulativeChiSquareDistribution
NonCentralCumulativeChiSquareDistribution(Real df, Real ncp)
Definition:
chisquaredistribution.hpp:43
QuantLib::NonCentralCumulativeChiSquareDistribution::df_
Real df_
Definition:
chisquaredistribution.hpp:47
QuantLib::NonCentralCumulativeChiSquareSankaranApprox
Definition:
chisquaredistribution.hpp:50
QuantLib::NonCentralCumulativeChiSquareSankaranApprox::NonCentralCumulativeChiSquareSankaranApprox
NonCentralCumulativeChiSquareSankaranApprox(Real df, Real ncp)
Definition:
chisquaredistribution.hpp:52
QuantLib::NonCentralCumulativeChiSquareSankaranApprox::operator()
Real operator()(Real x) const
Definition:
chisquaredistribution.cpp:93
QuantLib::NonCentralCumulativeChiSquareSankaranApprox::ncp_
Real ncp_
Definition:
chisquaredistribution.hpp:56
QuantLib::NonCentralCumulativeChiSquareSankaranApprox::df_
Real df_
Definition:
chisquaredistribution.hpp:56
QuantLib::Real
QL_REAL Real
real number
Definition:
types.hpp:50
QuantLib::Size
std::size_t Size
size of a container
Definition:
types.hpp:58
QuantLib
Definition:
any.hpp:35
types.hpp
Custom types.
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