Preamble

Dedication

And what is romantic, Kay —
And what is love?
Need we ask anyone to tell us these things?

Acknowledgements

This work builds on the contributions of many people in the R and Open Source communities. In particular, I would like to acknowledge extensive material taken from Diez, Barr, and Çetinkaya-Rundel (2014), Grolemund and Wickham (2017), Irizarry (2019), Kim and Ismay (2019), Jenny Bryan (2019), Diez, Barr, and Çetinkaya-Rundel (2014), Downey (2012), Grolemund and Wickham (2017), Kuhn and Silge (2020), and Legler and Roback (2019).

Alboukadel Kassambara, Andrew Tran, Thomas Mock and others kindly allowed for the re-use and/or modification of their work.

Thanks to contributions from Harvard students, colleagues and random people I met on the internet: Albert Rivero, Nicholas Dow, Celine Vendler, Sophia Zheng, Maria Burzillo, Robert McKenzie, Deborah Gonzalez, Beau Meche, Evelyn Cai, Miro Bergam, Jessica Edwards, Emma Freeman, Cassidy Bargell, Yao Yu, Vivian Zhang, Ishan Bhatt, Mak Famulari, Tahmid Ahmed, Eliot Min, Hannah Valencia, Asmer Safi, Erin Guetzloe, Shea Jenkins, Thomas Weiss, Diego Martinez, Andy Wang, Tyler Simko, Jake Berg, Connor Rust, Liam Rust, Alla Baranovsky, Carine Hajjar, Diego Arias, Becca Gill, Stephanie Yao and Tyler Simko.

I would like to gratefully acknowledge funding from The Derek Bok Center for Teaching and Learning at Harvard University, via its Digital Teaching Fellows and Learning Lab Undergraduate Fellows programs.