The R programming language is popular among statisticians. It is written in C and Fortran and is available under the GNU General Public License. R has support for modeling, statistical tests, time-series analysis, classification, visualization, and clustering. The Comprehensive R Archive Network (CRAN) and other repository websites offer thousands of R packages for various tasks.
Download R from http://www.r-project.org/.
The latest R version as of August 2014 was 3.1.1. The rpy2 package facilitates interfacing with R from Python. Install rpy2 as follows with
$ pip install rpy2 $ pip freeze|grep rpy2 rpy2==2.4.2
If you already have rpy2 installed, follow the instructions on http://rpy.sourceforge.net/rpy2/doc-dev/html/overview.html ...