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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/test/statistics.h"
#include <math.h>
namespace webrtc {
namespace test {
Statistics::Statistics() : sum_(0.0), sum_squared_(0.0), count_(0) {}
void Statistics::AddSample(double sample) {
sum_ += sample;
sum_squared_ += sample * sample;
++count_;
}
double Statistics::Mean() const {
if (count_ == 0)
return 0.0;
return sum_ / count_;
}
double Statistics::Variance() const {
if (count_ == 0)
return 0.0;
return sum_squared_ / count_ - Mean() * Mean();
}
double Statistics::StandardDeviation() const {
return sqrt(Variance());
}
} // namespace test
} // namespace webrtc
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