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sample_kurtosis.test.js
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sample_kurtosis.test.js
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/* eslint no-shadow: 0 */
const test = require("tap").test;
const ss = require("../");
test("sample kurtosis", function (t) {
t.test("the kurtosis of an empty sample is null", function (t) {
const data = [];
t.throws(function () {
ss.sampleKurtosis(data);
});
t.end();
});
t.test("the kurtosis of an sample with one number is null", function (t) {
const data = [1];
t.throws(function () {
ss.sampleKurtosis(data);
});
t.end();
});
t.test("the kurtosis of an sample with two numbers is null", function (t) {
const data = [1, 2];
t.throws(function () {
ss.sampleKurtosis(data);
});
t.end();
});
t.test(
"the kurtosis of an sample with three numbers is null",
function (t) {
const data = [1, 2, 3];
t.throws(function () {
ss.sampleKurtosis(data);
});
t.end();
}
);
t.test("can calculate the kurtosis of SAS example 1", function (t) {
// Data and answer taken from KURTOSIS function documentation at
// https://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a000245906.htm
const data = [5, 9, 3, 6];
t.equal(+ss.sampleKurtosis(data).toPrecision(10), 0.928);
t.end();
});
t.test("can calculate the kurtosis of SAS example 2", function (t) {
// Data and answer taken from KURTOSIS function documentation at
// https://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a000245906.htm
const data = [5, 8, 9, 6];
t.equal(+ss.sampleKurtosis(data).toPrecision(10), -3.3);
t.end();
});
t.test("can calculate the kurtosis of SAS example 3", function (t) {
// Data and answer taken from KURTOSIS function documentation at
// https://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a000245906.htm
const data = [8, 9, 6, 1];
t.equal(+ss.sampleKurtosis(data).toPrecision(10), 1.5);
t.end();
});
t.test("can calculate the kurtosis of SAS example 4", function (t) {
// Data and answer taken from KURTOSIS function documentation at
// https://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a000245906.htm
const data = [8, 1, 6, 1];
t.equal(+ss.sampleKurtosis(data).toPrecision(10), -4.483379501);
t.end();
});
t.end();
});