Class to calculate the CL upper limit using the Feldman-Cousins method as described in PRD V57 #7, p3873-3889.

The default confidence interval calculated using this method is 90% This is set either by having a default the constructor, or using the appropriate fraction when instantiating an object of this class (e.g. 0.9)

The simple extension to a gaussian resolution function bounded at zero has not been addressed as yet -> ‘time is of the essence’ as they write on the wall of the maze in that classic game ...

VARIABLES THAT CAN BE ALTERED

=> depending on your desired precision: The initial values of fMuMin, fMuMax, fMuStep and fNMax are those used in the PRD:

fMuMin = 0.0
fMuMax = 50.0
fMuStep= 0.005

but there is total flexibility in changing this should you desire.

see example of use in $ROOTSYS/tutorials/math/FeldmanCousins.C

see note about: "Should I use TRolke, TFeldmanCousins, TLimit?" in the TRolke class description.

Author: : Adrian Bevan, Liverpool University

Copyright Liverpool University 2001 bevan.nosp@m.@sla.nosp@m.c.sta.nosp@m.nfor.nosp@m.d.edu

Definition at line 47 of file TFeldmanCousins.h.

Public Member Functions
	TFeldmanCousins (Double_t newCL=0.9, TString options="")
	Constructor.

virtual	~TFeldmanCousins ()

Double_t	CalculateLowerLimit (Double_t Nobserved, Double_t Nbackground)
	given Nobserved and Nbackground, try different values of mu that give lower limits that are consistent with Nobserved.

Double_t	CalculateUpperLimit (Double_t Nobserved, Double_t Nbackground)
	given Nobserved and Nbackground, try different values of mu that give upper limits that are consistent with Nobserved.

Double_t	GetCL (void) const

Double_t	GetLowerLimit (void) const

Double_t	GetMuMax (void) const

Double_t	GetMuMin (void) const

Double_t	GetMuStep (void) const

Double_t	GetNbackground (void) const

Double_t	GetNMax (void) const

Double_t	GetNobserved (void) const

Double_t	GetUpperLimit (void) const

void	SetCL (Double_t newCL)

void	SetMuMax (Double_t newMax=50.0)
	Set maximum value of signal to use in calculating the tables.

void	SetMuMin (Double_t newMin=0.0)

void	SetMuStep (Double_t newMuStep=0.005)
	Set the step in signal to use when generating tables.

void	SetNbackground (Double_t Nbg)

void	SetNobserved (Double_t NObs)

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor.

	TObject (const TObject &object)
	TObject copy ctor.

virtual	~TObject ()
	TObject destructor.

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract.

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad.

virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action.

ULong_t	CheckedHash ()
	Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object.

virtual const char *	ClassName () const
	Returns name of class to which the object belongs.

virtual void	Clear (Option_t *="")

virtual TObject *	Clone (const char *newname="") const
	Make a clone of an object using the Streamer facility.

virtual Int_t	Compare (const TObject *obj) const
	Compare abstract method.

virtual void	Copy (TObject &object) const
	Copy this to obj.

virtual void	Delete (Option_t *option="")
	Delete this object.

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Computes distance from point (px,py) to the object.

virtual void	Draw (Option_t *option="")
	Default Draw method for all objects.

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs.

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current selected pad for instance with: `gROOT->SetSelectedPad(gPad)`.

virtual void	Dump () const
	Dump contents of object on stdout.

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message.

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g.

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray.

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py).

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message.

virtual TObject *	FindObject (const char *name) const
	Must be redefined in derived classes.

virtual TObject *	FindObject (const TObject *obj) const
	Must be redefined in derived classes.

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object.

virtual const char *	GetIconName () const
	Returns mime type name of object.

virtual const char *	GetName () const
	Returns name of object.

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py).

virtual Option_t *	GetOption () const

virtual const char *	GetTitle () const
	Returns title of object.

virtual UInt_t	GetUniqueID () const
	Return the unique object id.

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out.

virtual ULong_t	Hash () const
	Return hash value for this object.

Bool_t	HasInconsistentHash () const
	Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e.

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message.

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname".

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl.

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas.

void	InvertBit (UInt_t f)

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory).

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects).

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

virtual Bool_t	IsSortable () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

virtual void	ls (Option_t *option="") const
	The ls function lists the contents of a class on stdout.

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary).

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification.

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete.

void	operator delete (void *ptr)
	Operator delete.

void	operator delete[] (void *ptr)
	Operator delete [].

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)
	TObject assignment operator.

virtual void	Paint (Option_t *option="")
	This method must be overridden if a class wants to paint itself.

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list.

virtual void	Print (Option_t *option="") const
	This method must be overridden when a class wants to print itself.

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory.

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove this object from a list.

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename.

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save a primitive as a C++ statement(s) on output stream "out".

void	SetBit (UInt_t f)

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f.

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object.

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id.

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message.

R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked.

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message.

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory.

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory.

Protected Member Functions
Int_t	FindLimitsFromTable (Double_t mu)
	calculate the probability table for a given mu for n = 0, NMAX and return 1 if the number of observed events is consistent with the CL bad

Double_t	Prob (Int_t N, Double_t mu, Double_t B)
	Calculate the poissonian probability for a mean of mu+B events with a variance of N.

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected).

void	MakeZombie ()

Protected Attributes
Double_t	fCL

Double_t	fLowerLimit

Double_t	fMuMax

Double_t	fMuMin

Double_t	fMuStep

Double_t	fNbackground

Int_t	fNMax

Int_t	fNMuStep

Double_t	fNobserved

Int_t	fQUICK

Double_t	fUpperLimit

Additional Inherited Members
Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 , kBitMask = 0x00ffffff }

enum	{ kSingleKey = BIT(0) , kOverwrite = BIT(1) , kWriteDelete = BIT(2) }

enum	EDeprecatedStatusBits { kObjInCanvas = BIT(3) }

enum	EStatusBits { kCanDelete = BIT(0) , kMustCleanup = BIT(3) , kIsReferenced = BIT(4) , kHasUUID = BIT(5) , kCannotPick = BIT(6) , kNoContextMenu = BIT(8) , kInvalidObject = BIT(13) }

Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag.

static Bool_t	GetObjectStat ()
	Get status of object stat flag.

static void	SetDtorOnly (void *obj)
	Set destructor only flag.

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable.

Protected Types inherited from TObject
enum	{ kOnlyPrepStep = BIT(3) }

#include <TFeldmanCousins.h>

Inheritance diagram for TFeldmanCousins:

[legend]

Constructor & Destructor Documentation

◆ TFeldmanCousins()

TFeldmanCousins::TFeldmanCousins	(	Double_t	newCL = `0.9`,
		TString	options = `""`
	)

Constructor.

Definition at line 57 of file TFeldmanCousins.cxx.

◆ ~TFeldmanCousins()

TFeldmanCousins::~TFeldmanCousins ( )

virtual

Definition at line 79 of file TFeldmanCousins.cxx.

Member Function Documentation

◆ CalculateLowerLimit()

Double_t TFeldmanCousins::CalculateLowerLimit	(	Double_t	Nobserved,
		Double_t	Nbackground
	)

given Nobserved and Nbackground, try different values of mu that give lower limits that are consistent with Nobserved.

The closed interval (plus any stragglers) corresponds to the F&C interval

Definition at line 88 of file TFeldmanCousins.cxx.

◆ CalculateUpperLimit()

Double_t TFeldmanCousins::CalculateUpperLimit	(	Double_t	Nobserved,
		Double_t	Nbackground
	)

given Nobserved and Nbackground, try different values of mu that give upper limits that are consistent with Nobserved.

The closed interval (plus any stragglers) corresponds to the F&C interval

Definition at line 100 of file TFeldmanCousins.cxx.

◆ FindLimitsFromTable()

Int_t TFeldmanCousins::FindLimitsFromTable ( Double_t mu )

protected

calculate the probability table for a given mu for n = 0, NMAX and return 1 if the number of observed events is consistent with the CL bad

Definition at line 155 of file TFeldmanCousins.cxx.

◆ GetCL()

Double_t TFeldmanCousins::GetCL ( void ) const

inline

Definition at line 93 of file TFeldmanCousins.h.

◆ GetLowerLimit()

Double_t TFeldmanCousins::GetLowerLimit ( void ) const

inline

Definition at line 90 of file TFeldmanCousins.h.

◆ GetMuMax()

Double_t TFeldmanCousins::GetMuMax ( void ) const

inline

Definition at line 96 of file TFeldmanCousins.h.

◆ GetMuMin()

Double_t TFeldmanCousins::GetMuMin ( void ) const

inline

Definition at line 95 of file TFeldmanCousins.h.

◆ GetMuStep()

Double_t TFeldmanCousins::GetMuStep ( void ) const

inline

Definition at line 97 of file TFeldmanCousins.h.

◆ GetNbackground()

Double_t TFeldmanCousins::GetNbackground ( void ) const

inline

Definition at line 92 of file TFeldmanCousins.h.

◆ GetNMax()

Double_t TFeldmanCousins::GetNMax ( void ) const

inline

Definition at line 98 of file TFeldmanCousins.h.

◆ GetNobserved()

Double_t TFeldmanCousins::GetNobserved ( void ) const

inline

Definition at line 91 of file TFeldmanCousins.h.

◆ GetUpperLimit()

Double_t TFeldmanCousins::GetUpperLimit ( void ) const

inline

Definition at line 89 of file TFeldmanCousins.h.

◆ Prob()

Double_t TFeldmanCousins::Prob	(	Int_t	N,
		Double_t	mu,
		Double_t	B
	)

protected

Calculate the poissonian probability for a mean of mu+B events with a variance of N.

Definition at line 201 of file TFeldmanCousins.cxx.

◆ SetCL()

void TFeldmanCousins::SetCL ( Double_t newCL )

inline

Definition at line 102 of file TFeldmanCousins.h.

◆ SetMuMax()

void TFeldmanCousins::SetMuMax ( Double_t newMax = 50.0 )

Set maximum value of signal to use in calculating the tables.

Definition at line 209 of file TFeldmanCousins.cxx.

◆ SetMuMin()

void TFeldmanCousins::SetMuMin ( Double_t newMin = 0.0 )

inline

Definition at line 104 of file TFeldmanCousins.h.

◆ SetMuStep()

void TFeldmanCousins::SetMuStep ( Double_t newMuStep = 0.005 )

Set the step in signal to use when generating tables.

Definition at line 219 of file TFeldmanCousins.cxx.

◆ SetNbackground()

void TFeldmanCousins::SetNbackground ( Double_t Nbg )

inline

Definition at line 101 of file TFeldmanCousins.h.

◆ SetNobserved()

void TFeldmanCousins::SetNobserved ( Double_t NObs )

inline

Definition at line 100 of file TFeldmanCousins.h.

Member Data Documentation

◆ fCL

Double_t TFeldmanCousins::fCL

protected

Definition at line 49 of file TFeldmanCousins.h.

◆ fLowerLimit

Double_t TFeldmanCousins::fLowerLimit

protected

Definition at line 51 of file TFeldmanCousins.h.

◆ fMuMax

Double_t TFeldmanCousins::fMuMax

protected

Definition at line 55 of file TFeldmanCousins.h.

◆ fMuMin

Double_t TFeldmanCousins::fMuMin

protected

Definition at line 54 of file TFeldmanCousins.h.

◆ fMuStep

Double_t TFeldmanCousins::fMuStep

protected

Definition at line 56 of file TFeldmanCousins.h.

◆ fNbackground

Double_t TFeldmanCousins::fNbackground

protected

Definition at line 53 of file TFeldmanCousins.h.

◆ fNMax

Int_t TFeldmanCousins::fNMax

protected

Definition at line 58 of file TFeldmanCousins.h.

◆ fNMuStep

Int_t TFeldmanCousins::fNMuStep

protected

Definition at line 57 of file TFeldmanCousins.h.

◆ fNobserved

Double_t TFeldmanCousins::fNobserved

protected

Definition at line 52 of file TFeldmanCousins.h.

◆ fQUICK

Int_t TFeldmanCousins::fQUICK

protected

Definition at line 59 of file TFeldmanCousins.h.

◆ fUpperLimit

Double_t TFeldmanCousins::fUpperLimit

protected

Definition at line 50 of file TFeldmanCousins.h.

Libraries for TFeldmanCousins:

[legend]

The documentation for this class was generated from the following files:

math/physics/inc/TFeldmanCousins.h
math/physics/src/TFeldmanCousins.cxx

VARIABLES THAT CAN BE ALTERED

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ TFeldmanCousins()

◆ ~TFeldmanCousins()

Member Function Documentation

◆ CalculateLowerLimit()

◆ CalculateUpperLimit()

◆ FindLimitsFromTable()

◆ GetCL()

◆ GetLowerLimit()

◆ GetMuMax()

◆ GetMuMin()

◆ GetMuStep()

◆ GetNbackground()

◆ GetNMax()

◆ GetNobserved()

◆ GetUpperLimit()

◆ Prob()

◆ SetCL()

◆ SetMuMax()

◆ SetMuMin()

◆ SetMuStep()

◆ SetNbackground()

◆ SetNobserved()

Member Data Documentation

◆ fCL

◆ fLowerLimit

◆ fMuMax

◆ fMuMin

◆ fMuStep

◆ fNbackground

◆ fNMax

◆ fNMuStep

◆ fNobserved

◆ fQUICK

◆ fUpperLimit