locutus/esm/python/statistics/geometric_mean.js

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

import { assertStatisticsArray, toStatisticNumber } from "../_helpers/_statistics.js";
export function geometric_mean(data) {
    //      discuss at: https://locutus.io/python/statistics/geometric_mean/
    // parity verified: Python 3.12
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Returns the geometric mean for a non-empty dataset of positive numbers.
    //       example 1: geometric_mean([54, 24, 36])
    //       returns 1: 36.000000000000014
    //       example 2: geometric_mean([1, 3, 9])
    //       returns 2: 3
    //       example 3: geometric_mean([2.5, 6.25])
    //       returns 3: 3.9528470752104745
    const values = assertStatisticsArray(data, 'geometric_mean').map((value) => toStatisticNumber(value, 'geometric_mean'));
    if (values.length === 0 || values.some((value) => value <= 0)) {
        throw new Error('geometric mean requires a non-empty dataset containing positive numbers');
    }
    const logSum = values.reduce((sum, value) => sum + Math.log(value), 0);
    return Math.exp(logSum / values.length);
}