Fisher.h

#ifndef _theplu_yat_statistics_fisher_
#define _theplu_yat_statistics_fisher_ 

// $Id: Fisher.h 2555 2011-08-18 15:44:59Z peter $

/*
  Copyright (C) 2004, 2005 Peter Johansson
  Copyright (C) 2006, 2007, 2008 Jari Häkkinen, Peter Johansson
  Copyright (C) 2009, 2011 Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat library is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 3 of the
  License, or (at your option) any later version.

  The yat library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with yat. If not, see <http://www.gnu.org/licenses/>.
*/

namespace theplu {
namespace yat {
namespace statistics {  
  class Fisher
  {
  
  public:
    Fisher(void);

    virtual ~Fisher(void);
         
    
    double Chi2(void) const;

    void expected(double& a, double& b, double& c, double& d) const;

    unsigned int& minimum_size(void);

    const unsigned int& minimum_size(void) const;

    double p_value() const;
    
    double p_value_one_sided() const;
    
    double oddsratio(const unsigned int a, const unsigned int b, 
                     const unsigned int c, const unsigned int d);

    double oddsratio(void) const;

  private:
    bool calculate_p_exact() const;

    // two-sided
    double p_value_approximative(void) const;
    //two-sided
    double p_value_exact(void) const;

    unsigned int a_;
    unsigned int b_;
    unsigned int c_;
    unsigned int d_;
    unsigned int minimum_size_;
    double oddsratio_;
  };

}}} // of namespace statistics, yat, and theplu

#endif