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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
22Represents 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
38
39////////////////////////////////////////////////////////////////////////////////
40/// Construct the pull of the RooRealVar 'meas'.
41///
42/// \param[in] name Name of the pull variable.
43/// \param[in] title The title (for plotting).
44/// \param[in] meas The measurement. This variable needs to have an error, and therefore is a RooRealVar.
45/// \param[in] truth The true value.
46RooPullVar::RooPullVar(const char* name, const char* title, RooRealVar& meas, RooAbsReal& truth) :
47 RooAbsReal(name, title),
48 _meas("meas","Measurement",this,meas),
49 _true("true","Truth",this,truth)
50{
51}
52
53
54
55
56
57////////////////////////////////////////////////////////////////////////////////
58/// Copy constructor
59
60RooPullVar::RooPullVar(const RooPullVar& other, const char* name) :
61 RooAbsReal(other, name),
62 _meas("meas",this,other._meas),
63 _true("true",this,other._true)
64{
65}
66
67////////////////////////////////////////////////////////////////////////////////
68/// Calculate pull. Use asymmetric error if defined in measurement,
69/// otherwise use symmetric error. If measurement has no error
70/// return zero.
71
73{
74 const auto& meas = _meas.arg();
75 if (meas.hasAsymError()) {
76 double delta = _meas-_true ;
77 if (delta<0) {
78 return delta/meas.getAsymErrorHi() ;
79 } else {
80 return -delta/meas.getAsymErrorLo() ;
81 }
82 } else if (meas.hasError()) {
83 return (_meas-_true)/meas.getError() ;
84 } else {
85 return 0 ;
86 }
87}
#define ClassImp(name)
Definition Rtypes.h:377
char name[80]
Definition TGX11.cxx:110
Abstract base class for objects that represent a real value and implements functionality common to al...
Definition RooAbsReal.h:59
Represents the pull of a measurement w.r.t.
Definition RooPullVar.h:24
RooPullVar()=default
double evaluate() const override
Calculate pull.
RooTemplateProxy< RooRealVar > _meas
Definition RooPullVar.h:36
RooRealProxy _true
Definition RooPullVar.h:37
Variable that can be changed from the outside.
Definition RooRealVar.h:37
const T & arg() const
Return reference to object held in proxy.