Patrick Burns - This is a great introduction to several aspects of R programming.
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Programming R - This one isn't a downloadable PDF, its a collection of wiki pages focused.The book is well written, the sample code is clearly explained, and the material is generally easy to follow.Johnson also gives a nice introduction to regression model fitting.The book assumes some knowledge of statistics and is focused more on programming so you'll need to have an understanding of the underlying principles.It also touches on programming.You'll be safe with any (or all) of these.
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R-directory Learn R E-Books, free E-Books on R, since R is freely available there is quite a bit of educational material available for free as well.100, happiness guarantee, created with Sketch.The content is very similar.The great thing about this one is that all of Kerns' code is downloadable (from.The (physical) book is available for purchase, or you can download a copy of it for free.