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R




The main site for R is www.r-project.org.
 
Many R resources are available only by first selecting a CRAN mirror. 

CRAN is an acronym for "Comprehensive R Archive Network".  The CRAN mirror (link) at Carnegie Mellon University (CMU) is a reasonable first choice for most users in the United States.  CRAN mirrors in other countries are also available.
 
R comes with a broad set of statistical, data management, and graphical tools with its Base package.  Beyond the base R package, there are many contributed packages that extend R's functionality.  A complete (and dynamic) list of R contributed packaged is available here.
 
Helpful groupings of related R packages are available via the Task Views at (link).


Here is a link to a short video of the head of the NIST Statistical Engineering Division, Dr. Antonio Possolo, giving a testimonial to R during the useR! 2010 conference.


For some interesting comments from the R Core Development team (and assorted others), see the R-fortune.pdf file attached at the bottom of Quotes.