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