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// @(#)root/hist:$Name: $:$Id: TLimit.h,v 1.2 2010/05/03 16:51:17 auterman Exp $
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// Author: Christophe.Delaere@cern.ch 21/08/2002
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#ifndef ROOT_TLimit
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#define ROOT_TLimit
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#ifndef ROOT_TObject
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#include "TObject.h"
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#endif
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#ifndef ROOT_TMath
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#include "TMath.h"
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#endif
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class TConfidenceLevel;
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class TRandom;
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class TLimitDataSource;
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class TArrayD;
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class TOrdCollection;
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//____________________________________________________________________
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//
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// TLimit
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//
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// This class computes 95% Confidence Levels using a given statistic.
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// By default, the build-in LogLikelihood is used.
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//
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// Implemented by C. Delaere from the mclimit code written by Tom Junk.
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// reference: HEP-EX/9902006
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// See http://cern.ch/thomasj/searchlimits/ecl.html for more details.
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//____________________________________________________________________
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class TLimit {
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public:
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TLimit() {}
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virtual ~TLimit() {}
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static TConfidenceLevel *ComputeLimit(TLimitDataSource * data,
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Int_t nmc =50000,
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bool stat = false,
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TRandom * generator = NULL,
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Double_t(*statistic) (Double_t, Double_t,Double_t) =&(TLimit::LogLikelihood));
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protected:
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static TLimitDataSource *Fluctuate(TLimitDataSource * input, bool init,TRandom *, bool stat=false);
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inline static Double_t LogLikelihood(Double_t s, Double_t b, Double_t d) { return d * TMath::Log(1 + (s / b)); }
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private:
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static TArrayD *fgTable; // a log table... just to speed up calculation
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static TOrdCollection *fgSystNames; // Collection of systematics names
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ClassDef(TLimit, 2) // Class to compute 95% CL limits
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};
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#endif
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