locutus/esm/r/stats/variance.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

import { sampleVariance, toRNumericArray } from "../_helpers/_stats.js";
export function variance(x) {
    //      discuss at: https://locutus.io/r/variance/
    // parity verified: R 4.4
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: JS-safe equivalent of R's var() for a plain vector; matrix/data-frame forms are out of scope.
    //       example 1: variance([1, 2, 3])
    //       returns 1: 1
    //       example 2: variance([1, 2, 3, 4])
    //       returns 2: 1.6666666666666667
    //       example 3: variance([2, 4, 6])
    //       returns 3: 4
    return sampleVariance(toRNumericArray(x, 'variance'));
}