@angular/benchpress
Version:
Benchpress - a framework for e2e performance tests
37 lines • 4.88 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
export class Statistic {
static calculateCoefficientOfVariation(sample, mean) {
return Statistic.calculateStandardDeviation(sample, mean) / mean * 100;
}
static calculateMean(samples) {
let total = 0;
// TODO: use reduce
samples.forEach(x => total += x);
return total / samples.length;
}
static calculateStandardDeviation(samples, mean) {
let deviation = 0;
// TODO: use reduce
samples.forEach(x => deviation += Math.pow(x - mean, 2));
deviation = deviation / (samples.length);
deviation = Math.sqrt(deviation);
return deviation;
}
static calculateRegressionSlope(xValues, xMean, yValues, yMean) {
// See https://en.wikipedia.org/wiki/Simple_linear_regression
let dividendSum = 0;
let divisorSum = 0;
for (let i = 0; i < xValues.length; i++) {
dividendSum += (xValues[i] - xMean) * (yValues[i] - yMean);
divisorSum += Math.pow(xValues[i] - xMean, 2);
}
return dividendSum / divisorSum;
}
}
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