sample_standard_deviation.test.js

/* eslint no-shadow: 0 */

const test = require("tap").test;
const ss = require("../dist/simple-statistics.js");

function rnd(x) {
    return Math.round(x * 1000) / 1000;
}

test("sampleStandardDeviation", function (t) {
    t.test(
        "can get the standard deviation of an example on wikipedia",
        function (t) {
            t.equal(
                rnd(ss.sampleStandardDeviation([2, 4, 4, 4, 5, 5, 7, 9])),
                2.138
            );
            t.end();
        }
    );

    t.throws(function () {
        ss.sampleStandardDeviation([]);
    }, "zero-length corner case");

    t.end();
});