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/****************************************************************************
* Copyright (C) from 2009 to Present EPAM Systems.
*
* This file is part of Indigo toolkit.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
***************************************************************************/
#include "math/statistics.h"
#include <math.h>
using namespace indigo;
//
// MeanEstimator
//
MeanEstimator::MeanEstimator() : _count(0), _sum(0), _sum_sq(0)
{
}
void MeanEstimator::addValue(float value)
{
_sum += value;
_sum_sq += value * value;
_count++;
}
int MeanEstimator::getCount() const
{
return _count;
}
void MeanEstimator::setCount(int count)
{
_count = count;
}
float MeanEstimator::mean() const
{
if (_count == 0)
return 0;
return _sum / _count;
}
float MeanEstimator::meanEsimationError() const
{
if (_count == 0)
return 0;
float sigma = sqrt(_sum_sq / _count - pow(_sum / _count, 2));
return 2 * sigma / sqrt((float)_count);
}
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