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

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2014-12-16 23:53:29 +00:00
var test = require('tape');
var ss = require('../');
test('r-squared', function(t) {
test('says that the r squared of a two-point line is perfect', function(t) {
var d = [[0, 0], [1, 1]];
var l = ss.linear_regression().data(d);
t.equal(ss.r_squared(d, l.line()), 1);
t.end();
});
test('says that the r squared of a three-point line is not perfect', function(t) {
var d = [[0, 0], [0.5, 0.2], [1, 1]];
var l = ss.linear_regression().data(d);
t.notEqual(ss.r_squared(d, l.line()), 1);
t.end();
});
test('r-squared of single sample is 1', function(t) {
var d = [[0, 0]];
var l = ss.linear_regression().data(d);
t.equal(ss.r_squared(d, l.line()), 1);
t.end();
});
t.end();
});