62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
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var vows = require('vows');
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var assert = require('assert');
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var suite = vows.describe('jStat.distribution');
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require('../env.js');
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var tol = 0.0000001;
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suite.addBatch({
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'cauchy pdf': {
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'topic': function() {
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return jStat;
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},
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'check pdf calculation': function(jStat) {
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var pdf = jStat.cauchy.pdf;
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assert.epsilon(tol, pdf(1, 0, 1), 1 / (2 * Math.PI));
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assert.epsilon(tol, pdf(3, 0, 1), 1 / (10 * Math.PI));
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assert.epsilon(tol, pdf(-2, 0, 1), 1 / (5 * Math.PI));
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//Location parameter
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assert.epsilon(tol, pdf(1, 1, 1), 1 / Math.PI);
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assert.epsilon(tol, pdf(0, -3, 1), 1 / (10 * Math.PI));
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//Scale parameter
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assert.epsilon(tol, pdf(0, 1, 3), 1 / ((10 / 3) * Math.PI));
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assert.epsilon(tol, pdf(0, 1, 0.5), 1 / (2.5 * Math.PI));
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//Negative test cases
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assert.epsilon(tol, pdf(0, 0, -3), 0);
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},
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'check cdf calculations': function(jStat) {
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var cdf = jStat.cauchy.cdf;
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assert.epsilon(tol, cdf(0, 0, 1), 0.5);
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assert.epsilon(tol, cdf(3, 0, 1), (Math.atan(3) / Math.PI) + 0.5);
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assert.epsilon(tol, cdf(0, 1, 1), (Math.atan(-1) / Math.PI) + 0.5);
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assert.epsilon(tol, cdf(3, 1, 1), (Math.atan(2) / Math.PI) + 0.5);
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assert.epsilon(tol, cdf(0, 1, 2), (Math.atan(-0.5) / Math.PI) + 0.5);
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assert.epsilon(tol, cdf(1, 0, 0.5), (Math.atan(2) / Math.PI) + 0.5);
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},
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'median': function(jStat) {
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var median = jStat.cauchy.median;
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assert.epsilon(tol, median(0, 1), 0);
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assert.epsilon(tol, median(0, 4), 0);
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assert.epsilon(tol, median(-2, 1), -2);
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},
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'mode': function(jStat) {
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var mode = jStat.cauchy.mode;
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assert.epsilon(tol, mode(0, 1), 0);
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assert.epsilon(tol, mode(0, 4), 0);
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assert.epsilon(tol, mode(-2, 1), -2);
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}
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}
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});
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suite.export(module);
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