A better tittle is "Introduction to Econometrics with Base R". You should justify and explain why you use base R in this book rather than tidyverse, despite the fact that there could be several reasons you could use tidyverse rather than base R: 1) Many of the things you do throughout the book could be done more easily with tidyverse. 2) tidyverse is more used than base R. 3) it is much easier to understand tidyverse code.

Very useful resource but it risks being outdated at publication because it is based on base R.