`GNU S' - A language and environment for statistical computing and graphics. R
is similar to S, which was developed at Bell Laboratories by John Chambers et
al. It provides a wide variety of statistical and graphical techniques (linear
and nonlinear modelling, statistical tests, time series analysis,
classification, clustering, ...). R is designed as a true computer language with
control-flow constructions for iteration and alternation, and it allows users to
add additional functionality by defining new functions. For computationally
intensive taskes, Fortran and C code can be linked and called at run time.