References

Grolemund, Garrett. 2014. Hands-on Programming with R. O’Reilly. https://rstudio-education.github.io/hopr/.

Schloerke, Barret, JJ Allaire, and Barbara Borges. 2019. Learnr: Interactive Tutorials for R. https://CRAN.R-project.org/package=learnr.

Wickham, Hadley. 2019. Advance R. 2nd ed. Boca Raton, Florida: Chapman; Hall/CRC. https://adv-r.hadley.nz/.

Wickham, Hadley, Winston Chang, Lionel Henry, Thomas Lin Pedersen, Kohske Takahashi, Claus Wilke, Kara Woo, and Hiroaki Yutani. 2019. Ggplot2: Create Elegant Data Visualisations Using the Grammar of Graphics. https://CRAN.R-project.org/package=ggplot2.