Function quantile

src/util/number.ts:682–688

(ascArr: number[], p: number)

 * @param ascArr
 */
export function quantile(ascArr: number[], p: number): number {
    const H = (ascArr.length - 1) * p + 1;
    const h = mathFloor(H);
    const v = +ascArr[h - 1];
    const e = H - h;
    return e ? v + e * (ascArr[h] - v) : v;
}

type IntervalItem = {
    interval: [number, number]