References

Holtz, Yan. 2018. “Help and Inspiration for R Charts.” The R Graph Gallery. https://www.r-graph-gallery.com/.

Wickham, Hadley, and others. 2014. “Tidy Data.” Journal of Statistical Software 59 (10): 1–23.

Wilkinson, Leland. 2012. “The Grammar of Graphics.” In Handbook of Computational Statistics, 375–414. Springer.