@numio/bigmath/src/MAD/utils.js

@numio/bigmath is an arbitrary-precision arithmetic library. It can be used for basic operations with decimal numbers (integers and float)

import { meanInner } from "../mean/utils.js";
import { PipeInner } from "../pipe/utils.js";
import { quartileInner } from "../quartile/utils.js";
import { ASC } from "../sort/constants.js";
import { sortInner } from "../sort/utils.js";
export const MADInner = (array, { from }) => {
    if (array.length < 3) {
        throw Error("To calculate MAD you need at least 3 elements");
    }
    const fromMap = {
        median: quartileInner(array).Q2,
        mean: meanInner(array),
    };
    const madArray = array.map((el) => {
        return new PipeInner().sub([el, fromMap[from]]).abs().bi;
    });
    const sorted = sortInner(madArray, ASC);
    return quartileInner(sorted).Q2;
};