R is a powerful and freely available statistical language. In Debian it is installed as r-base.
The Debian packages are also available from the comprehensive R archive network (or CRAN) by adding the following line to your /etc/apt/sources.list:
deb http://cran.r-project.org/bin/linux/debian woody main
# wajig install r-base
We can now install either RSPython or RPy. Both provide a Python interface to R, and RSPython also provides an R interface to Python while RPy is generally easier to use than RSPython! RSPython is not packaged for Debian yet, but RPy is.