Bitcoin Statistic in Hourly extraction

bitcoin-hourly.js

var moment = require('moment');
var histohour = require('./histohour.json');
var stats = require("stats-lite")
var d = histohour.Data;
let h = {};
for (let i=0;i<d.length;i++){
    let date = moment(d[i].time*1000);
    console.log(date);
    let hour = date.hours();
    let diff = d[i].close - d[i].open;
    if (!h[hour]){
        h[hour] = [];
    }
    h[hour].push(diff);   
}

for (let i=1;i<=23;i++){
    console.log("hour="+i+" mean="+stats.mean(h[i])+" sd="+stats.stdev(h[i])+" max="+Math.max.apply(null, h[i]).toFixed(2)+" min="+Math.min.apply(null, h[i]).toFixed(2)); 
}