describe statistics of data in javascript (like pandas.DataFrame.describe)

describe.js

import {jStat} from 'jstat'

/**
 * describe statistics of data
 * like: http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.describe.html
 * @param  {Object} data - e.g. {x:[1,2,3],y:[6,7,8]}
 * @return {Object}      - e.g. {x:{mean:2,...},y:{...}}
 */
export function describe(data){
   var labels = {
       'count':d=>d.length,
       'mean':d=>jStat.mean(d),
       'stdev':d=>jStat.stdev(d),
       'min':d=>jStat.min(d),
       'max':d=>jStat.max(d),
       'quart_lower':d=>jStat.quartiles(d)[0],
       'quart_median':d=>jStat.quartiles(d)[1],
       'quart_upper':d=>jStat.quartiles(d)[2],
       }
   var descriptions = {}
   for (var col in data){
       descriptions[col]={}
       var series = data[col]
       for (var label in labels){
           var f = labels[label]
           descriptions[col][label]=f(series)
       }

   }
   return descriptions
}


// test
var data={x:[],y:[]}
for (var i=0;i<200;i++){
   data.x.push(Math.random())
   data.y.push(Math.random()*10-2)
}
var desc = describe(data)
console.log(JSON.stringify(desc,null,4))