source: trunk/yat/statistics/Pearson.cc @ 1703

Last change on this file since 1703 was 1487, checked in by Jari Häkkinen, 13 years ago

Addresses #436. GPL license copy reference should also be updated.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.4 KB
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1// $Id: Pearson.cc 1487 2008-09-10 08:41:36Z jari $
2
3/*
4  Copyright (C) 2004, 2005 Peter Johansson
5  Copyright (C) 2006, 2007 Jari Häkkinen, Peter Johansson
6  Copyright (C) 2008 Peter Johansson
7
8  This file is part of the yat library, http://dev.thep.lu.se/yat
9
10  The yat library is free software; you can redistribute it and/or
11  modify it under the terms of the GNU General Public License as
12  published by the Free Software Foundation; either version 3 of the
13  License, or (at your option) any later version.
14
15  The yat library is distributed in the hope that it will be useful,
16  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  General Public License for more details.
19
20  You should have received a copy of the GNU General Public License
21  along with yat. If not, see <http://www.gnu.org/licenses/>.
22*/
23
24#include "Pearson.h"
25#include "AveragerPair.h"
26#include "AveragerPairWeighted.h"
27#include "yat/utility/VectorBase.h"
28#include "yat/classifier/DataLookupWeighted1D.h"
29#include "yat/classifier/Target.h"
30
31#include <cmath>
32
33namespace theplu {
34namespace yat {
35namespace statistics { 
36
37  Pearson::Pearson(bool b) 
38    : Score(b)
39  {
40  }
41
42  Pearson::~Pearson(void)
43  {
44  }
45
46  double Pearson::score(const classifier::Target& target, 
47                        const utility::VectorBase& value) const
48  {
49    AveragerPair ap;
50    for (size_t i=0; i<target.size(); i++){
51      if (target.binary(i))
52        ap.add(1, value(i));
53      else
54        ap.add(-1, value(i));
55    }
56    double r = ap.correlation();
57    if (r<0 && absolute_)
58      return -r;
59    return r;
60  } 
61   
62  double Pearson::score(const classifier::Target& target, 
63                        const classifier::DataLookupWeighted1D& value) const
64  {
65    AveragerPairWeighted ap;
66    for (size_t i=0; i<target.size(); i++){
67      if (target.binary(i))
68        ap.add(1, value.data(i),1,value.weight(i));
69      else
70        ap.add(-1, value.data(i),1,value.weight(i));
71    }
72    double r = ap.correlation();
73    if (r<0 && absolute_)
74      return -r;
75    return r;
76  }
77
78  double Pearson::score(const classifier::Target& target, 
79                        const utility::VectorBase& value,
80                        const utility::VectorBase& weight) const
81  {
82    AveragerPairWeighted ap;
83    for (size_t i=0; i<target.size(); i++){
84      if (target.binary(i))
85        ap.add(1, value(i),1,weight(i));
86      else
87        ap.add(-1, value(i),1,weight(i));
88    } 
89    double r = ap.correlation();
90    if (r<0 && absolute_)
91      return -r;
92    return r;
93  }
94
95}}} // of namespace statistics, yat, and theplu
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