For Further Reading
Getting started with R
- Hands on Programming with R
- R for Data Science (R4DS)
- BTEP R Introductory Series
- Base R cheat sheet
- RStudio cheat sheet
General help with ggplot2
Troubleshooting error messages
- Epidemiologist R Handbook (47 Common errors)
- R for Graduate Students (Troubleshooting Error Messages)