source: trunk/yat/statistics/FoldChange.cc @ 779

Last change on this file since 779 was 779, checked in by Peter, 15 years ago

Refs #101

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1// $Id: FoldChange.cc 779 2007-03-05 18:58:30Z peter $
2
3/*
4  Copyright (C) The authors contributing to this file.
5
6  This file is part of the yat library, http://lev.thep.lu.se/trac/yat
7
8  The yat library is free software; you can redistribute it and/or
9  modify it under the terms of the GNU General Public License as
10  published by the Free Software Foundation; either version 2 of the
11  License, or (at your option) any later version.
12
13  The yat library is distributed in the hope that it will be useful,
14  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  General Public License for more details.
17
18  You should have received a copy of the GNU General Public License
19  along with this program; if not, write to the Free Software
20  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
21  02111-1307, USA.
22*/
23
24#include "FoldChange.h"
25#include "Score.h"
26#include "Averager.h"
27#include "AveragerWeighted.h"
28#include "yat/classifier/DataLookupWeighted1D.h"
29#include "yat/classifier/Target.h"
30#include "yat/utility/vector.h"
31
32namespace theplu {
33namespace yat {
34namespace statistics {
35
36  FoldChange::FoldChange(bool absolute)
37    : Score(absolute)
38  {
39  }
40
41  double FoldChange::score(const classifier::Target& target, 
42                           const utility::vector& value) const
43  {
44    Averager pos;
45    Averager neg;
46
47    for (size_t i=0; i<value.size(); i++) 
48      if (target.binary(i))
49        pos.add(value(i));
50      else
51        neg.add(value(i));
52         
53    if (absolute_)
54      return fabs(pos.mean()-neg.mean());
55    return pos.mean()-neg.mean();
56  }
57
58  double FoldChange::score(const classifier::Target& target, 
59                           const classifier::DataLookupWeighted1D& value) const
60  {
61    AveragerWeighted pos;
62    AveragerWeighted neg;
63
64    for (size_t i=0; i<value.size(); i++) 
65      if (target.binary(i))
66        pos.add(value.data(i),value.weight(i));
67      else
68        neg.add(value.data(i),value.weight(i));
69         
70    if (absolute_)
71      return fabs(pos.mean()-neg.mean());
72    return pos.mean()-neg.mean();
73  }
74
75  double FoldChange::score(const classifier::Target& target, 
76                           const utility::vector& value,
77                           const utility::vector& weight) const
78  {
79    AveragerWeighted pos;
80    AveragerWeighted neg;
81
82    for (size_t i=0; i<value.size(); i++) 
83      if (target.binary(i))
84        pos.add(value(i),weight(i));
85      else
86        neg.add(value(i),weight(i));
87         
88    if (absolute_)
89      return fabs(pos.mean()-neg.mean());
90    return pos.mean()-neg.mean();
91  }
92
93}}} // of namespace statistics, yat, and theplu
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