S is a project of statistics research at Bell Labs since 1976. In 1998, S was the first statistical system to get the Software System Award, the top software award from the Association for Computing Machinery, ACM. S is a strongly functional, and object-oriented, highly extensible programming language, with a general interactive shell environment, extensive graphing abilities, a set of functions for mathematical and statistical manipulations and exploration of data sets, with more available in optional libraries/packages. It provides a variety of statistical (linear and nonlinear modeling, classical statistical tests, time series analysis, classification, clustering, ...) and graphical techniques. It can display graphical representations of data from a custom command line, and easily output well designed, publishable plots, including mathematical symbols and formulae where needed. It has yielded two more popular implementations, S-Plus (commercial) and R (Open Source).
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- Omega Project for Statistical Computing Joint project to provide variety of open source software for 3 extant statistical languages: S, R, Lisp-Stat. Focus: new directions, more so web-based systems, Java and JVM, and distributed systems.
- Burns Statistics Software, consulting, training, mainly for the fund management industry; working papers, tutorials, downloads, other information on quantitative finance and programming in S language (R and S-Plus).
- Modern Applied Statistics with S By William N. Venables, B.D. Ripley; Springer-Verlag, 2002, ISBN 0387954570. Guide to using S-Plus and R for statistical analyses: introduces using S, and is a course in modern statistical methods.
- The Basics of S-Plus Author's page with errata, prior editions, S links.
- S-News and S-News-Advisory Mailing Lists Discussion group on S, S-Plus statistics, graphics, programming. Topics: programming, usage questions and suggestions; problem reports; new software announcements; books, articles; conferences, educational events; short job announcements.
- S Programming Author's page with errata, description, contact information.
- ACM: Software System Award Press release from The Association for Computing Machinery naming Dr. John M. Chambers of Bell Labs as recipient of 1998 award for developing the S System.
- Programming with Data: A Guide to the S Language By John M. Chambers; Springer-Verlag, 1998, ISBN 0387985034. Premier reference work on S, written by its chief designer, describes new, greatly extended version.
- S Programming By William N. Venables, B.D. Ripley; Springer-Verlag, 2000, ISBN 0387989668. In-depth guide for researchers, graduate students, to writing software in either or both S variants: S-Plus, open source R.