1 | // $Id: tTest.cc 1487 2008-09-10 08:41:36Z jari $ |
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2 | |
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3 | /* |
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4 | Copyright (C) 2004 Jari Häkkinen, Peter Johansson |
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5 | Copyright (C) 2005 Peter Johansson |
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6 | Copyright (C) 2006 Jari Häkkinen, Peter Johansson, Markus Ringnér |
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7 | Copyright (C) 2007 Jari Häkkinen, Peter Johansson |
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8 | |
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9 | This file is part of the yat library, http://dev.thep.lu.se/yat |
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10 | |
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11 | The yat library is free software; you can redistribute it and/or |
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12 | modify it under the terms of the GNU General Public License as |
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13 | published by the Free Software Foundation; either version 3 of the |
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14 | License, or (at your option) any later version. |
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15 | |
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16 | The yat library is distributed in the hope that it will be useful, |
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17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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19 | General Public License for more details. |
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20 | |
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21 | You should have received a copy of the GNU General Public License |
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22 | along with yat. If not, see <http://www.gnu.org/licenses/>. |
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23 | */ |
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24 | |
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25 | #include "tTest.h" |
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26 | #include "AveragerWeighted.h" |
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27 | #include "tScore.h" |
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28 | |
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29 | #include <algorithm> |
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30 | #include <cassert> |
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31 | #include <cmath> |
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32 | |
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33 | namespace theplu { |
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34 | namespace yat { |
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35 | namespace statistics { |
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36 | |
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37 | tTest::tTest(void) |
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38 | : updated_(false) |
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39 | { |
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40 | } |
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41 | |
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42 | |
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43 | void tTest::add(double x, bool target, double w) |
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44 | { |
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45 | if (!w) |
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46 | return; |
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47 | if (target) |
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48 | pos_.add(x,w); |
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49 | else |
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50 | neg_.add(x,w); |
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51 | updated_=false; |
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52 | } |
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53 | |
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54 | |
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55 | void tTest::reset(void) |
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56 | { |
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57 | pos_.reset(); |
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58 | neg_.reset(); |
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59 | dof_=0; |
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60 | t_=0; |
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61 | updated_=false; |
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62 | } |
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63 | |
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64 | |
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65 | double tTest::score(void) |
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66 | { |
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67 | if (!updated_){ |
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68 | tScore score(false); |
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69 | t_ = score.score(pos_, neg_, &dof_); |
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70 | updated_=true; |
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71 | } |
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72 | return t_; |
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73 | } |
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74 | |
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75 | |
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76 | double tTest::p_value(void) const |
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77 | { |
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78 | double p=2*p_value_one_sided(); |
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79 | return std::min(p,2-p); |
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80 | } |
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81 | |
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82 | |
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83 | double tTest::p_value_one_sided(void) const |
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84 | { |
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85 | double t=t_; |
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86 | double dof=dof_; |
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87 | if (!updated_){ |
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88 | tScore score(false); |
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89 | t = score.score(pos_, neg_, &dof); |
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90 | } |
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91 | if (!dof) |
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92 | return 1.0; |
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93 | return gsl_cdf_tdist_Q(t, dof); |
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94 | } |
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95 | |
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96 | }}} // of namespace statistics, yat, and theplu |
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