I work in a statistics-related field and use R daily. Most R books emphasize applications for statistics, not R itself; they're written for non-programmers. R i

I work in a statistics-related field and use R daily. Most R books emphasize applications for statistics, not R itself; they're written for non-programmers. R in a Nutshell overviews R itself and assumes basic programming experience. I personally prefer this method, since I can just Google for any particular stats functions I need. If you're already a programmer, this is probably the R book you want.