11 References

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Ingo Feinerer, Kurt Hornik, and David Meyer. 2008. “Text Mining Infrastructure in R.” Journal of Statistical Software 25 (5): 1–54. http://www.jstatsoft.org/v25/i05/.

Mullen, Lincoln. 2016. Tokenizers: A Consistent Interface to Tokenize Natural Language Text. https://CRAN.R-project.org/package=tokenizers.

Robinson, David. 2016. Gutenbergr: Download and Process Public Domain Works from Project Gutenberg. https://cran.rstudio.com/package=gutenbergr.

Robinson, David, Matthieu Gomez, Boris Demeshev, Dieter Menne, Benjamin Nutter, Luke Johnston, Ben Bolker, Francois Briatte, and Hadley Wickham. 2015. Broom: Convert Statistical Analysis Objects into Tidy Data Frames. https://CRAN.R-project.org/package=broom.

Silge, Julia. 2016. Janeaustenr: Jane Austen’s Complete Novels. https://CRAN.R-project.org/package=janeaustenr.

Silge, Julia, and David Robinson. 2016. “Tidytext: Text Mining and Analysis Using Tidy Data Principles in R.” JOSS 1 (3). The Open Journal. doi:10.21105/joss.00037.

Wickham, Hadley. 2007. “Reshaping Data with the reshape Package.” Journal of Statistical Software 21 (12): 1–20. http://www.jstatsoft.org/v21/i12/.

———. 2009. Ggplot2: Elegant Graphics for Data Analysis. Springer-Verlag New York. http://ggplot2.org.

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

———. 2016. Tidyr: Easily Tidy Data with `spread()` and `gather()` Functions. https://CRAN.R-project.org/package=tidyr.

Wickham, Hadley, and Romain Francois. 2016. Dplyr: A Grammar of Data Manipulation. https://CRAN.R-project.org/package=dplyr.