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permutation_test.test.js
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permutation_test.test.js
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/* eslint no-shadow: 0 */
const test = require("tap").test;
const Random = require("random-js");
const random = new Random.Random(Random.MersenneTwister19937.seed(0));
const ss = require("../dist/simple-statistics.js");
function rng() {
return random.real(0, 1);
}
test("permutation test", function (t) {
t.test(
"P-value of identical distributions being different should be 1",
function (t) {
t.equal(
ss.permutationTest([2, 2, 2, 2, 2], [2, 2, 2, 2, 2]),
1,
undefined,
rng
);
t.end();
}
);
t.test(
"P-value of distribution less than itself should be 1",
function (t) {
t.equal(
ss.permutationTest(
[2, 2, 2, 2, 2],
[2, 2, 2, 2, 2],
"greater",
undefined,
rng
),
1
);
t.end();
}
);
t.test(
"P-value of small sample greater than large sample should be 0",
function (t) {
t.ok(
ss.permutationTest(
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[
99999, 99999, 99999, 99999, 99999, 99999, 99999, 99999,
99999, 99999
],
"less",
undefined,
rng
) < ss.epsilon
);
t.end();
}
);
t.test(
"permutationTest should throw error if wrong argument received",
function (t) {
t.throws(function () {
ss.permutationTest([1, 69, 420], [42, 42, 42], "one-tailed");
}, "alternative must be one of specified options");
t.end();
}
);
t.end();
});