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 //--------------------------------------------------------------------------
 // File and Version Information:
 //      Consistency.hh,v 1.3 1996/08/25 07:50:33 jake Exp
 //
 // Description:
 //      The Consistency class is a top level parent for various
 //      statistical classes
 //
 //      This class also defines an enum ConsistentStatus for representing
 //      various error conditions
 //
 //      Return an object of this class from a chisquared calculation, for
 //      example, so that probability and chisquared can be treated
 //      directly.  Future subclasses might implement other statistics
 //      (Poisson, etc), and this class could use operations to combine, 
 //      print, etc. (Or other statistics could be added to this class, 
 //      allowing it to convert between different measures; the uses
 //      will dictate the structure)
 //
 //      Note: implementation of this class is minimal at present; please
 //      read the comments!
 //
 // Environment:
 //      Software developed for the BaBar Detector at the SLAC B-Factory.
 //
 // Author List:
 //      Bob Jacobsen 
 //
 // Copyright Information:
 //      Copyright (C) 1995, 1996
 //
 //------------------------------------------------------------------------
 
 #ifndef CONSISTENCY_HH
 #define CONSISTENCY_HH
 
 //-----------------
 // BaBar Headers --
 //-----------------
 #include "BaBar/BaBar.hh"
 
 class Consistency {
 
   public:
 
   // default constructor; sets internal state to noMeasure
   Consistency();
 
   virtual ~Consistency() {}
 
   // abstract virtual member for returning the statistical consistency
   // of the represented observation
   virtual double consistency() const = 0;
 
   // represent the various ways that a statistical measure could be bad
   enum ConsistentStatus { OK, noMeasure, underFlow, unPhysical};
 
   // OK          just that; usable statistical data
   // noMeasure   no statistical statement possible; DOF == 0, for example.
   //             may or may not be consistent
   // underFlow   probability too small to calculate with; may or may not want
   //             to treat as zero, but value may have been treated by machine
   //             underflow handling
   // unPhysical  because of a "can't happen" condition, probability is
   //             identically equal to zero;
 
   // return the status
   ConsistentStatus status() const {return _stat;}
 
   // use as a double returns the consistency value; this member is
   // intended as just a convenience, and may be removed if it makes
   // trouble.
   inline operator double() const { return consistency(); }
 
   const char*  rcsId( ) const;
 
 protected:
   ConsistentStatus _stat;
 };
 
 #endif
 

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