Further references
- Hadley Wickham's paper, Tidy data, Introducing the framework, http://vita.had.co.nz/papers/tidy-data.pdf.
- Shakespeare's Romeo and Juliet, just because it is so well written. I would suggest you read one of the best editions from the Oxford University Press.
- A cheat sheet for the other
dplyr
join functions, which will help you gain a wider view of the possibilities available withindplyr
for merging tables: http://stat545.com/bit001_dplyr-cheatsheet.html.