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/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitCore                                                       *
 *    File: $Id: RooChi2MCSModule.h 25185 2008-08-20 14:00:42Z wouter $
 * Authors:                                                                  *
 *   WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu       *
 *   DK, David Kirkby,    UC Irvine,         dkirkby@uci.edu                 *
 *                                                                           *
 * Copyright (c) 2000-2005, Regents of the University of California          *
 *                          and Stanford University. All rights reserved.    *
 *                                                                           *
 * Redistribution and use in source and binary forms,                        *
 * with or without modification, are permitted according to the terms        *
 * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
 *****************************************************************************/

#ifndef ROO_CHI2_MCS_MODULE
#define ROO_CHI2_MCS_MODULE

#include "RooAbsMCStudyModule.h"
#include <string>

class RooChi2MCSModule : public RooAbsMCStudyModule {
public:

  RooChi2MCSModule() ;
  RooChi2MCSModule(const RooChi2MCSModule& other) ;
  virtual ~RooChi2MCSModule() ;

  Bool_t initializeInstance() ; 
  Bool_t initializeRun(Int_t /*numSamples*/) ; 
  RooDataSet* finalizeRun() ;
  Bool_t processAfterFit(Int_t /*sampleNum*/)  ;
	
private:

  RooDataSet* _data ;    // Summary dataset to store results
  RooRealVar* _chi2 ;    // Chi^2 of function w.r.t. data
  RooRealVar* _ndof ;    // Number of degrees of freedom
  RooRealVar* _chi2red ; // Reduced Chi^2 w.r.t data
  RooRealVar* _prob ;    // Probability of chi^2,nDOF combination

  ClassDef(RooChi2MCSModule,0) // MCStudy module to calculate chi2 between binned data and fit 
} ;


#endif

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