source: branches/0.4-stable/yat/statistics/tTest.cc @ 1743

Last change on this file since 1743 was 1743, checked in by Peter, 12 years ago

updating copyright statements

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 1.9 KB
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1// $Id: tTest.cc 1743 2009-01-23 14:20:30Z peter $
2
3/*
4  Copyright (C) 2004 Jari Häkkinen, Peter Johansson
5  Copyright (C) 2005 Peter Johansson
6  Copyright (C) 2006 Jari Häkkinen, Peter Johansson, Markus Ringnér
7  Copyright (C) 2007 Jari Häkkinen, Peter Johansson
8  Copyright (C) 2008 Peter Johansson
9
10  This file is part of the yat library, http://dev.thep.lu.se/yat
11
12  The yat library is free software; you can redistribute it and/or
13  modify it under the terms of the GNU General Public License as
14  published by the Free Software Foundation; either version 2 of the
15  License, or (at your option) any later version.
16
17  The yat library is distributed in the hope that it will be useful,
18  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20  General Public License for more details.
21
22  You should have received a copy of the GNU General Public License
23  along with this program; if not, write to the Free Software
24  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25  02111-1307, USA.
26*/
27
28#include "tTest.h"
29#include "AveragerWeighted.h"
30#include "tScore.h"
31
32#include <algorithm>
33#include <cassert>
34#include <cmath>
35
36namespace theplu {
37namespace yat {
38namespace statistics { 
39
40  tTest::tTest(void) 
41    : updated_(false)
42  {
43  }
44
45 
46  void tTest::add(double x, bool target, double w)
47  {
48    if (!w)
49      return;
50    if (target)
51      pos_.add(x,w);
52    else
53      neg_.add(x,w);
54    updated_=false;
55  }
56
57  double tTest::score(void)
58  {
59    if (!updated_){
60      tScore score(false);
61      t_ = score.score(pos_, neg_, &dof_);
62      updated_=true;
63    }
64    return t_;
65  }
66
67
68  double tTest::p_value(void) const
69  {
70    double p=2*p_value_one_sided();
71    return std::min(p,2-p); 
72  }
73
74
75  double tTest::p_value_one_sided(void) const
76  {
77    double t=t_;
78    double dof=dof_;
79    if (!updated_){
80      tScore score(false);
81      t = score.score(pos_, neg_, &dof);
82    }
83    if (!dof)
84      return 1.0;
85    return gsl_cdf_tdist_Q(t, dof);
86  }
87
88}}} // of namespace statistics, yat, and theplu
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