ROOT   Reference Guide
RooPullVar.cxx
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1/*****************************************************************************
2 * Project: RooFit *
3 * Package: RooFitCore *
4 * @(#)root/roofitcore:$Id$
5 * Authors: *
6 * WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu *
7 * DK, David Kirkby, UC Irvine, dkirkby@uci.edu *
8 * *
9 * Copyright (c) 2000-2005, Regents of the University of California *
11 * *
12 * Redistribution and use in source and binary forms, *
13 * with or without modification, are permitted according to the terms *
15 *****************************************************************************/
16
17/**
18\file RooPullVar.cxx
19\class RooPullVar
20\ingroup Roofitcore
21
22RooPullVar represents the pull of a measurement w.r.t. the true value
23using the measurement and its error. Both the true value and
24the measured value (with error) are taken from two user-supplied
25RooRealVars. If the measured parameter has an asymmetric error, the proper
26side of that error will be used:
27\f[
28 \mathrm{Pull}_x = \frac{x_\mathrm{meas}-x_\mathrm{true}}{\Delta_x}
29\f]
30**/
31
32#include "RooPullVar.h"
33
34#include "RooAbsReal.h"
35#include "RooRealVar.h"
36
37using namespace std;
38
40;
41
42
43////////////////////////////////////////////////////////////////////////////////
44/// Default constructor
45
47{
48}
49
50
51
52////////////////////////////////////////////////////////////////////////////////
53/// Construct the pull of the RooRealVar 'meas'.
54///
55/// \param[in] name Name of the pull variable.
56/// \param[in] title The title (for plotting).
57/// \param[in] meas The measurement. This variable needs to have an error, and therefore is a RooRealVar.
58/// \param[in] truth The true value.
59RooPullVar::RooPullVar(const char* name, const char* title, RooRealVar& meas, RooAbsReal& truth) :
60 RooAbsReal(name, title),
61 _meas("meas","Measurement",this,meas),
62 _true("true","Truth",this,truth)
63{
64}
65
66
67
68
69
70////////////////////////////////////////////////////////////////////////////////
71/// Copy constructor
72
73RooPullVar::RooPullVar(const RooPullVar& other, const char* name) :
74 RooAbsReal(other, name),
75 _meas("meas",this,other._meas),
76 _true("true",this,other._true)
77{
78}
79
80
81
82////////////////////////////////////////////////////////////////////////////////
83/// Destructor
84
86{
87}
88
89
90
91////////////////////////////////////////////////////////////////////////////////
92/// Calculate pull. Use asymmetric error if defined in measurement,
93/// otherwise use symmetric error. If measurement has no error
94/// return zero.
95
97{
98 const auto& meas = _meas.arg();
99 if (meas.hasAsymError()) {
100 double delta = _meas-_true ;
101 if (delta<0) {
102 return delta/meas.getAsymErrorHi() ;
103 } else {
104 return -delta/meas.getAsymErrorLo() ;
105 }
106 } else if (meas.hasError()) {
107 return (_meas-_true)/meas.getError() ;
108 } else {
109 return 0 ;
110 }
111}
112
113
#define ClassImp(name)
Definition: Rtypes.h:375
char name[80]
Definition: TGX11.cxx:110
RooAbsReal is the common abstract base class for objects that represent a real value and implements f...
Definition: RooAbsReal.h:62
RooPullVar represents the pull of a measurement w.r.t.
Definition: RooPullVar.h:24
RooPullVar()
Default constructor.
Definition: RooPullVar.cxx:46
double evaluate() const override
Calculate pull.
Definition: RooPullVar.cxx:96
~RooPullVar() override
Destructor.
Definition: RooPullVar.cxx:85
RooTemplateProxy< RooRealVar > _meas
Definition: RooPullVar.h:37
RooRealProxy _true
Definition: RooPullVar.h:38
RooRealVar represents a variable that can be changed from the outside.
Definition: RooRealVar.h:40
const T & arg() const
Return reference to object held in proxy.