S is a language and environment for data analysis originally developed at Bell Laboratories (of AT&T and now Lucent Technologies). It became the statistician's calculator for the 1990s, allowing easy access to the computing power and graphical capabilities of modern workstations and personal computers. Various implementations have been available, currently S-PLUS, a commercial system from the Insightful Corporation1 in Seattle, and R, an Open Source system written by a team of volunteers. Both can be ran on Windows and a range of UNIX / Linux operating systems: R also runs on Macintoshes...