R provides a wide variety of statistical and graphical techniques, including linear and nonlinear modeling, classical statistical tests, time-series analysis, classification, clustering, and others.
R is not the easiest language to learn. The focus of this article is to select some informative R books that aid statisticians and data miners to master this refined language, and exploit its full power. All of the books are available to download for free, with many of them released under a freely distributable license.