books.google.com - The cost of statistical computing software has precluded many universities from installing these valuable computational and analytical tools. R, a powerful open-source software package, was created in response to this issue. It has enjoyed explosive growth since its introduction, owing to its coherence,...http://books.google.com/books/about/Using_R_for_Introductory_Statistics.html?id=RAjNY11rJXIC&utm_source=gb-gplus-shareUsing R for Introductory Statistics