There is a good collection of R Cheat Sheets at RStudio that cover:
- Package Development Cheat Sheet
- Data Wrangling Cheat Sheet (using dplyr and tidyr)
- R Markdown Cheat Sheet
- R Markdown Reference Guide (using Markdown, Knitr and Pandoc)
R Cheat Sheets
There is a good collection of R Cheat Sheets at RStudio that cover: Package Development Cheat Sheet Data Wrangling Cheat Sheet (using dplyr and tidyr) R Markdown Cheat Sheet R Markdown Reference Guide (using Markdown, Knitr and Pandoc)
1–2 minutes
Max Hemingway 
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