50 lines
1.9 KiB
C++
50 lines
1.9 KiB
C++
/*UVOS*/
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/* This file is part of MAClient copyright © 2021 Carl Philipp Klemm.
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*
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* MAClient is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (GPL) version
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* 3 as published by the Free Software Foundation.
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*
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* MAClient is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MAClient. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "regessioncalculator.h"
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#include <stdexcept>
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#include <math.h>
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#include <QDebug>
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RegessionCalculator::RegessionCalculator(const std::vector<double>& xValues, const std::vector<double>& yValues)
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{
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if(xValues.size() == yValues.size())
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{
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this->xValues = xValues;
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this->yValues = yValues;
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double sumY = 0;
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double sumX = 0;
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double sumXTimesY = 0;
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double sumSquaredX = 0;
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double sumSquaredY = 0;
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for (unsigned i = 0; i < xValues.size(); i++)
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{
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sumY += yValues[i];
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sumX += xValues[i];
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sumSquaredX += xValues[i]*xValues[i];
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sumSquaredY += yValues[i]*yValues[i];
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sumXTimesY += xValues[i]*yValues[i];
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}
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slope = (sumXTimesY - (sumX*sumY)/xValues.size()) / (sumSquaredX - (sumX*sumX)/xValues.size());
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offset = sumY/xValues.size() - slope*(sumX/xValues.size());
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double error = (xValues.size()*sumSquaredY-sumY*sumY-slope*slope*(xValues.size()*sumSquaredX-sumX*sumX)) / (xValues.size()*(xValues.size()-2));
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stdError = sqrt( (error*error*xValues.size() ) / ( xValues.size()*sumSquaredX-sumX*sumX));
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}
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else throw std::invalid_argument("xValues and yValues need to be the same size");
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}
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