statfct.h

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/*

Copyright (c) 2003, Cornell University
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

   - Redistributions of source code must retain the above copyright notice,
       this list of conditions and the following disclaimer.
   - Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
   - Neither the name of Cornell University nor the names of its
       contributors may be used to endorse or promote products derived from
       this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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*/

#if !defined _STATFCT_H
#define _STATFCT_H

extern "C"
{
    /* if mode & 1 then return the complement of the cdf.
       if mode & 2 then return the natural logarithm
    */

    /** return the cdf of Gamma(alpha,gamma) at point x*gamma */
    double incomplete_gamma(double alpha, double x, int mode);
    
    /** return cdf of chi_square with n degrees of freedom at point chi2*/
    double chi_square(double chi2, double n, int mode);
    
    /** return the cdf of Beta(alpha,beta) at point x */
    double incomplete_beta(double x, double alpha, double beta, int mode);
    
    /** return cdf of Stunent with n degrees of freedom at t*/
    double student(double t, double n, int mode);
    
    /** return cdf of F-distribution(n,m) at F */
    double F(double F, double n, double m, int mode);
}

#endif // _STATFCT_H

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