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@IceCreamYou
IceCreamYou / percentile.js
Last active November 17, 2022 01:54
Utility functions to calculate percentiles and percent ranks in a JavaScript array.
// Returns the value at a given percentile in a sorted numeric array.
// "Linear interpolation between closest ranks" method
function percentile(arr, p) {
if (arr.length === 0) return 0;
if (typeof p !== 'number') throw new TypeError('p must be a number');
if (p <= 0) return arr[0];
if (p >= 1) return arr[arr.length - 1];
var index = (arr.length - 1) * p,
lower = Math.floor(index),