source: branches/peters_vector/lib/statistics/tScore.h @ 469

Last change on this file since 469 was 469, checked in by Peter, 16 years ago

non compiling checking before revision after design meeting

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1// $Id: tScore.h 469 2005-12-19 14:58:29Z peter $
2
3#ifndef _theplu_statistics_t_score_
4#define _theplu_statistics_t_score_
5
6// C++ tools include
7/////////////////////
8#include <c++_tools/statistics/Score.h>
9#include <c++_tools/gslapi/vector.h>
10
11#include <gsl/gsl_cdf.h>
12
13
14namespace theplu {
15namespace statistics { 
16
17  ///
18  /// Class for Fisher's t-test.
19  ///   
20  class tScore : public Score
21  {
22 
23  public:
24    ///
25    /// Default Constructor.
26    ///
27    tScore(bool absolute=true);
28
29    ///
30    /// Calculates the value of t-score, i.e. the ratio between
31    /// difference in mean and standard deviation of this
32    /// difference. \f$ \frac{ \vert \frac{1}{n_x}\sum x_i -
33    /// \frac{1}{n_y}\sum y_i \vert } {\frac{\sum x_i^2 + \sum
34    /// y_i^2}{n_x-1+n_y-1}} \f$
35    ///
36    /// @return t-score if absolute=true
37    /// absolute value of t-score is returned
38    ///
39    double score(const classifier::Target& target, 
40                 const classifier::VectorAbstract& value); 
41
42    ///
43    /// Weighted version of t-Score @return t-score if absolute=true
44    /// absolute value of t-score is returned
45    ///
46    double score(const classifier::Target& target, 
47                 const classifier::VectorAbstract& value, 
48                 const classifier::VectorAbstract& weight); 
49
50    ///
51    ///Calculates the p-value, i.e. the probability of observing a
52    ///t-score equally or larger if the null hypothesis is true. If P
53    ///is near zero, this casts doubt on this hypothesis. The null
54    ///hypothesis is ...  @return the one-sided p-value( if
55    ///absolute=true is used the two-sided p-value)
56    ///
57    double p_value() const;
58
59         
60         
61  private:
62    double t_;
63    int dof_;
64       
65  };
66
67}} // of namespace statistics and namespace theplu
68
69#endif
70
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