arraystat

README

Description

This module calculate Min, Max, Avg, % of standard deviation, median, quartiles, range and histogram from an array

• sum : the sum of all the values of the array
• nb : the number of values in the array
• avg : the average value (sum/nb)
• stddev : standard deviation in percent ( (value - avg) / nb / avg )
• min : the minimum value in the array
• q1 : the 1st quartile
• median : the median
• q3 : the last quartile
• max : the maximum value in the array
• range : the range of the array (max - min)
• histogram : a repartition of all the values of the array in 5 buckets

Install

Go into a node project and type the following :

$> npm install arraystat

Example

import arraystat from 'arraystat';

console.log(arraystat([1,2,3,4,5]));

/*
    {
        sum: 15,
        nb: 5,
        avg: 3,
        stddev: 0.4, // => 40 %
        min: 1,
        q1: 2,
        median: 3,
        q3: 4,
        max: 5,
        range: 4,
        histogram:
        [
            { min: 1, max: 1.8, nb: 1 },
            { min: 1.8, max: 2.6, nb: 1 },
            { min: 2.6, max: 3.4, nb: 1 },
            { min: 3.4, max: 4.2, nb: 1 },
            { min: 4.2, max: 5, nb: 1 }
        ]
    }
*/

Run

$> node test.js

Contributors

rustyconover => fix sort v1.1.3