Calculate Percentile

Calculate the nth percentile of an array using linear interpolation.

Code

General

const sorted = [...arr].sort((a, b) => a - b);
const index = (p / 100) * (sorted.length - 1);
const lower = Math.floor(index);
const fraction = index - lower;
return sorted[lower] + fraction * (sorted[lower + 1] - sorted[lower] || 0);

Parameters

arr(array)

Array of numbers

p(number)

Percentile (0-100)

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