Referencias

Wickham, Hadley. 2009. Ggplot2: Elegant Graphics for Data Analysis. 2nd ed. Springer Publishing Company, Incorporated.

———. 2011. “The Split-Apply-Combine Strategy for Data Analysis.” Journal of Statistical Software 40 (1): 1–29. http://www.jstatsoft.org/v40/i01/.

———. 2014. “Tidy Data.” Journal of Statistical Software, Articles 59 (10): 1–23. https://doi.org/10.18637/jss.v059.i10.

Wickham, Hadley, and Garrett Grolemund. 2017. R for Data Science: Import, Tidy, Transform, Visualize, and Model Data. 1st ed. O’Reilly Media, Inc.

Wilkinson, L., D. Wills, D. Rope, A. Norton, and R. Dubbs. 2005. The Grammar of Graphics. Statistics and Computing. Springer New York. https://books.google.com.mx/books?id=\_kRX4LoFfGQC.