trading-signals/dist/util/getQuartile.js

Technical indicators to run technical analysis with JavaScript / TypeScript.

import { getMedian } from './getMedian.js';
export function getQuartile(values, q) {
    const sorted = [...values].sort((a, b) => a - b);
    const n = sorted.length;
    const medianIndex = Math.floor(n / 2);
    if (q === 0.25) {
        return getMedian(sorted.slice(0, medianIndex));
    }
    else if (q === 0.75) {
        if (n % 2 === 0) {
            return getMedian(sorted.slice(medianIndex));
        }
        return getMedian(sorted.slice(medianIndex + 1));
    }
    const pos = (sorted.length - 1) * q;
    const base = Math.floor(pos);
    const rest = pos - base;
    return sorted[base] + (sorted[base + 1] - sorted[base]) * rest;
}
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