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vnl_chi_squared.h

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00001 #ifndef vnl_chi_squared_h_
00002 #define vnl_chi_squared_h_
00003 
00004 //:
00005 //  \file
00006 //  \brief Name space for various chi-squared distribution functions.
00007 //  \author Rupert Curwen, GE CRD, August 18th, 1998
00008 //
00009 //  \verbatim
00010 //  Modifications
00011 //  dac (Manchester) 26/03/2001: tidied up documentation
00012 //  \endverbatim
00013 //
00014 
00015 
00016 //: Compute cumulative distribution function value for chi-squared distribution
00017 extern float vnl_chi_squared_cumulative(float chisq, int dof);
00018 
00019 //------------------------------------------------------------
00020 
00021 //: Name space for various chi-squared distribution functions.
00022 //
00023 //\verbatim
00024 //  A[] and B[] are (pointers to) arrays containing histograms.
00025 //  If the 'normalize' parameter is true, each histogram will
00026 //  be implicitly normalized (so as to sum to 1) before the
00027 //  statistic is calculated :
00028 // 
00029 //  a[i] = A[i] / \sum_j A[j]
00030 //  b[i] = B[i] / \sum_j B[j]
00031 //
00032 //  *DO NOT* add scale factors to these functions or you will break 
00033 //  the code written by those who read the documentation. fsm.
00034 
00035 //      (a[i] - b[i])^2
00036 // \sum ---------------
00037 //   i       a[i]
00038 //\endverbatim
00039 //
00040 
00041 template <class T>
00042 double vnl_chi_squared_statistic_1 (T const *A, T const *B, 
00043                                     int n, bool normalize);
00044 
00045 //:
00046 //\verbatim
00047 //      (a[i] - b[i])^2
00048 // \sum ---------------
00049 //   i       b[i]
00050 //\endverbatim
00051 template <class T>
00052 double vnl_chi_squared_statistic_2 (T const *A, T const *B, 
00053                                     int n, bool normalize);
00054 
00055 //:
00056 //\verbatim
00057 //      (a[i] - b[i])^2
00058 // \sum ---------------
00059 //   i    a[i] + b[i]
00060 //\endverbatim
00061 template <class T>
00062 double vnl_chi_squared_statistic_12(T const *A, T const *B, 
00063                                     int n, bool normalize);
00064 
00065 #endif // vnl_chi_squared_h_

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