1 | // $Id: Naive.cc 1392 2008-07-28 19:35:30Z peter $ |
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2 | |
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3 | /* |
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4 | Copyright (C) 2004 Peter Johansson |
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5 | Copyright (C) 2005, 2006, 2007 Jari Häkkinen, Peter Johansson |
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6 | Copyright (C) 2008 Peter Johansson |
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7 | |
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8 | This file is part of the yat library, http://dev.thep.lu.se/yat |
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9 | |
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10 | The yat library is free software; you can redistribute it and/or |
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11 | modify it under the terms of the GNU General Public License as |
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12 | published by the Free Software Foundation; either version 2 of the |
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13 | License, or (at your option) any later version. |
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14 | |
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15 | The yat library is distributed in the hope that it will be useful, |
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16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | General Public License for more details. |
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19 | |
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20 | You should have received a copy of the GNU General Public License |
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21 | along with this program; if not, write to the Free Software |
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22 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
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23 | 02111-1307, USA. |
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24 | */ |
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25 | |
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26 | #include "Naive.h" |
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27 | #include "OneDimensional.h" |
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28 | #include "yat/statistics/Averager.h" |
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29 | #include "yat/statistics/AveragerWeighted.h" |
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30 | #include "yat/utility/VectorBase.h" |
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31 | |
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32 | #include <cmath> |
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33 | #include <iostream> |
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34 | |
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35 | namespace theplu { |
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36 | namespace yat { |
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37 | namespace regression { |
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38 | |
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39 | Naive::Naive(void) |
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40 | : OneDimensional(), mse_(0.0) |
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41 | { |
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42 | } |
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43 | |
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44 | Naive::~Naive(void) |
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45 | { |
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46 | } |
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47 | |
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48 | |
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49 | void Naive::fit(const utility::VectorBase& x, const utility::VectorBase& y) |
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50 | { |
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51 | ap_.reset(); |
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52 | for (size_t i=0; i<y.size(); i++) |
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53 | ap_.add(x(i),y(i)); |
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54 | chisq_ = ap_.y_averager().sum_xx_centered(); |
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55 | } |
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56 | |
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57 | |
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58 | double Naive::predict(const double x) const |
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59 | { |
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60 | return ap_.y_averager().mean(); |
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61 | } |
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62 | |
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63 | |
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64 | double Naive::s2(void) const |
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65 | { |
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66 | return chisq()/(ap_.n()-1); |
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67 | } |
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68 | |
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69 | |
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70 | double Naive::standard_error2(const double x) const |
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71 | { |
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72 | return s2()/ap_.n(); |
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73 | } |
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74 | |
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75 | }}} // of namespaces regression, yat, and theplu |
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