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[R] Gelman, Hill, and Vehtari's "Regression and Other Stories" is now free as a pdf from the authors!
tl;dr: The GOAT applied regression book (Gelman and Hill), has been updated after 15 years, and it's free!
Blurb: "Many textbooks on regression focus on theory and the simplest of examples. Real statistical problems, however, are complex and subtle. This is not a book about the theory of regression. It is a book about how to use regression to solve real problems of comparison, estimation, prediction, and causal inference. It focuses on practical issues such as sample size …!-->