The text is potentially a data management textbook.
The following is verbatim from Yihui Xie's readme.md file. I'll probably remove later, but it may be helpful to know where to turn if writing this thing goes bad.
This is a minimal example of a book based on R Markdown and bookdown (https://github.com/rstudio/bookdown). Please see the page "Get Started" at https://bookdown.org/yihui/bookdown/ for how to compile this example into HTML. You may generate a copy of the book in bookdown::pdf_book format by calling bookdown::render_book('index.Rmd', 'bookdown::pdf_book'). More detailed instructions are available here https://bookdown.org/yihui/bookdown/build-the-book.html.
You can find the preview of this example at https://bookdown.org/yihui/bookdown-demo/.