/usr/include/root/TMVA/SdivSqrtSplusB.h is in libroot-tmva-dev 5.34.30-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Author: Andreas Hoecker, Joerg Stelzer, Helge Voss, Kai Voss
/**********************************************************************************
* Project: TMVA - a Root-integrated toolkit for multivariate data analysis *
* Package: TMVA *
* Class : SdivSqrtSplusB *
* Web : http://tmva.sourceforge.net *
* *
* Description: Implementation of the SdivSqrtSplusB as separation criterion *
* S/sqrt(S + B) *
* *
* Authors (alphabetical): *
* Andreas Hoecker <Andreas.Hocker@cern.ch> - CERN, Switzerland *
* Helge Voss <Helge.Voss@cern.ch> - MPI-K Heidelberg, Germany *
* Kai Voss <Kai.Voss@cern.ch> - U. of Victoria, Canada *
* *
* Copyright (c) 2005: *
* CERN, Switzerland *
* U. of Victoria, Canada *
* Heidelberg U., Germany *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted according to the terms listed in LICENSE *
* (http://tmva.sourceforge.net/LICENSE) *
**********************************************************************************/
#ifndef ROOT_TMVA_SdivSqrtSplusB
#define ROOT_TMVA_SdivSqrtSplusB
//////////////////////////////////////////////////////////////////////////
// //
// SdivSqrtSplusB //
// //
// Implementation of the SdivSqrtSplusB as separation criterion //
// Index = S/sqrt(S+B) (statistical significance) //
// //
//////////////////////////////////////////////////////////////////////////
#ifndef ROOT_TMVA_SeparationBase
#include "TMVA/SeparationBase.h"
#endif
namespace TMVA {
class SdivSqrtSplusB : public SeparationBase {
public:
//constructor for the "statistical significance" index
SdivSqrtSplusB(): SeparationBase() { fName = "StatSig"; }
// copy constructor
SdivSqrtSplusB( const SdivSqrtSplusB& g): SeparationBase(g) {}
//destructor
virtual ~SdivSqrtSplusB() {}
// Return the gain in separation of the original sample is splitted in two sub-samples
// (N * Index_parent) - (N_left * Index_left) - (N_right * Index_right)
virtual Double_t GetSeparationGain( const Double_t& nSelS, const Double_t& nSelB,
const Double_t& nTotS, const Double_t& nTotB );
// return the Index (S/sqrt(S+B))
virtual Double_t GetSeparationIndex( const Double_t &s, const Double_t &b );
protected:
ClassDef(SdivSqrtSplusB,0) // Implementation of the SdivSqrtSplusB as separation criterion
};
} // namespace TMVA
#endif
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