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/*
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Math.h>
#include <AK/QuickSort.h>
#include <AK/StdLibExtraDetails.h>
#include <AK/Vector.h>
namespace AK {
template<typename T = float>
requires(IsArithmetic<T>) class Statistics {
public:
Statistics() = default;
~Statistics() = default;
void add(T const& value)
{
// FIXME: Check for an overflow
m_sum += value;
m_values.append(value);
}
T const sum() const { return m_sum; }
float average() const { return (float)sum() / size(); }
// FIXME: Implement a better algorithm
T const median()
{
quick_sort(m_values);
return m_values.at(size() / 2);
}
float standard_deviation() const { return sqrt(variance()); }
float variance() const
{
float summation = 0;
float avg = average();
for (T number : values()) {
float difference = (float)number - avg;
summation += (difference * difference);
}
summation = summation / size();
return summation;
}
Vector<T> const& values() const { return m_values; }
size_t size() const { return m_values.size(); }
private:
Vector<T> m_values;
T m_sum {};
};
}
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