filer/perf/simple-statistics/test/iqr.test.js

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2014-12-16 23:53:29 +00:00
var test = require('tape');
var ss = require('../');
test('interquartile range (iqr)', function(t) {
// Data and results from
// [Wikipedia](http://en.wikipedia.org/wiki/Quantile#Quantiles_of_a_population)
test('can get proper iqr of an even-length list', function(t) {
var even = [3, 6, 7, 8, 8, 10, 13, 15, 16, 20];
t.equal(ss.quantile(even, 0.75) - ss.quantile(even, 0.25), ss.iqr(even));
t.end();
});
test('can get proper iqr of an odd-length list', function(t) {
var odd = [3, 6, 7, 8, 8, 9, 10, 13, 15, 16, 20];
t.equal(ss.quantile(odd, 0.75) - ss.quantile(odd, 0.25), ss.iqr(odd));
t.end();
});
test('an iqr of a zero-length list produces null', function(t) {
t.equal(ss.iqr([]), null);
t.end();
});
t.end();
});