web-vitals-distribution
Version:
Probability Distribution Utility for Web Vitals
34 lines • 4.59 kB
JavaScript
import test from 'ava';
import { LogNormalDistribution } from './log-normal-distribution.js';
test('statistics', (t) => {
const d = new LogNormalDistribution(0, 1);
t.is(d.mu, 0, 'mu');
t.is(d.sigma, 1, 'sigma');
t.is(d.mean(), 1.648721270700128146849, 'mean');
t.is(d.median(), 1, 'median');
t.is(d.mode(), 0.3678794411714423215955, 'mode');
t.is(d.pdf(1), 0.3989422804014327, 'pdf');
t.is(d.cdf(1), 0.5, 'cdf1');
t.is(d.cdf(2), 0.7558914042144173, 'cdf2');
t.is(d.percentile(0.5), 1, 'cumulativeProbability');
});
test('create from mean and median', (t) => {
const d = LogNormalDistribution.fromMeanAndMedian(2, 1);
t.is(d.mu, 0, 'mu');
t.is(d.sigma, 1.1774100225154747, 'sigma');
t.is(d.mean(), 2, 'mean');
t.is(d.median(), 1, 'median');
t.is(d.mode(), 0.25, 'mode');
t.is(d.pdf(1), 0.33883037580155256, 'pdf');
t.is(d.cdf(1), 0.5, 'cdf1');
t.is(d.cdf(2), 0.7219704121715109, 'cdf2');
t.is(d.percentile(0.5), 1, 'cumulativeProbability');
});
test('create from cumulative distribution pair', (t) => {
const d = LogNormalDistribution.fromCumulativeDistributionPair(1, 0.5, 2, 0.7558914042144173);
t.is(d.mu, 0, 'mu');
t.is(d.sigma, 1, 'sigma');
t.is(d.cdf(1), 0.5, 'cdf1');
t.is(d.cdf(2), 0.7558914042144173, 'cdf2');
});
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