deno.land / x / simplestatistics@v7.8.3 / test / standard_deviation.test.js
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const test = require("tap").test;const ss = require("../dist/simple-statistics.js");
function rnd(x) { return Math.round(x * 1000) / 1000;}
test("standardDeviation", function (t) { t.test( "can get the standard deviation of an example on wikipedia", function (t) { t.equal(rnd(ss.standardDeviation([2, 4, 4, 4, 5, 5, 7, 9])), 2); t.end(); } );
// confirmed with numpy // In [4]: numpy.std([1,2,3]) // Out[4]: 0.81649658092772603 t.test("can get the standard deviation of 1-3", function (t) { t.equal(rnd(ss.standardDeviation([1, 2, 3])), 0.816); t.end(); });
t.test("zero-length array corner case", function (t) { t.throws(function () { ss.standardDeviation([]); }); t.end(); });
// In [6]: numpy.std([0,1,2,3,4,5,6,7,8,9,10]) // Out[6]: 3.1622776601683795 t.test("can get the standard deviation of 1-10", function (t) { t.equal( rnd(ss.standardDeviation([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10])), 3.162 ); t.end(); });
t.test("the standard deviation of one number is zero", function (t) { t.equal(rnd(ss.standardDeviation([1])), 0); t.end(); }); t.end();});
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