Tidy Data

Hadley Wickman, the author of the excellent plyr and ggplot2 packages, published a great article a couple years ago on “tidy data” at : https://www.blackhatworld.com/seo/6-ways-to-increase-your-website-traffic-get-ready-to-work-smart.740933/
When taking on your first data analysis project you quickly learn that 80% of your time is spent prepping data (data munging or data wrangling). We’d all be better off if data architects (form creators, business process authors, DBAs, etc.) were familiar with the intuitive concepts outlined by Wickman in this paper.