R is a language and run-time environment for carrying out interactive statistical data analysis.
It is not entirely dissimilar to the S language. Indeed, S users will find the environment quite familiar and a good deal of S software will run without change under R . R is the software that is used in 475.20x to carry out the data analysis taught in the course. Students will find that the exam assumes a familiarity with the software and the assignments explicitly require data analysis to be done in R . R is available as Free Software under the terms of the Free Software Foundation's GNU General Public License .