official example https://dc-js.github.io/dc.js/ official code for example https://dc-js.github.io/dc.js/docs/stock.html
https://github.com/crossfilter/crossfilter https://github.com/crossfilter
https://www.codeproject.com/Articles/693841/Making-Dashboards-with-Dc-js-Part-1-Using-Crossfil
https://dc-js.github.io/dc.js/
https://github.com/dc-js/dc.js/wiki
#more comprehensive example-- https://www.youtube.com/watch?v=8TBh5ghRZrI https://github.com/john-guerra/vastChallenge2017_example/tree/master/minichallenge_1
download d3.js file https://d3js.org/
tutorial https://riptutorial.com/d3-js