TestStatistic.h

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// @(#)root/roostats:$Id$
// Author: Kyle Cranmer, Lorenzo Moneta, Gregory Schott, Wouter Verkerke
/*************************************************************************
 * Copyright (C) 1995-2008, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOSTATS_TestStatistic
#define ROOSTATS_TestStatistic
 
 
 
 
#include "Rtypes.h"
 
class RooArgSet;
class RooAbsData;
 
namespace RooStats {
 
/** \class RooStats::TestStatistic
    \ingroup Roostats
 
   TestStatistic is an interface class to provide a facility for construction test statistics
   distributions to the NeymanConstruction class. All the actual samplers inherit from this class.
*/
 
class TestStatistic {
 
public:
   //TestStatistic();
   virtual ~TestStatistic() {
   }
 
   /// Main interface to evaluate the test statistic on a dataset given the
   /// values for the Null Parameters Of Interest.
   virtual Double_t Evaluate(RooAbsData& data, RooArgSet& nullPOI) = 0;
 
   virtual const TString GetVarName() const = 0;
 
   /// Defines the sign convention of the test statistic. Overwrite function if necessary.
   virtual  bool PValueIsRightTail(void) const { return true; }
 
   /// return detailed output: for fits this can be pulls, processing time, ... The returned pointer will not loose validity until another call to Evaluate.
   virtual const RooArgSet* GetDetailedOutput() const { return NULL; }
 
   /// interface to set conditional observables. If a test statistics needs them it will re-implement this function
   virtual void SetConditionalObservables(const RooArgSet& ) {}
 
   /// interface to set global observables. If a test statistics needs them it will re-implement this function
   virtual void SetGlobalObservables(const RooArgSet& ) {}
 
   
protected:
   ClassDef(TestStatistic,1) /// Interface for a TestStatistic
};
 
} // end namespace RooStats
 
 
#endif