Getting R:

Go to http://cran.stat.ucla.edu/

Select your operating system (e.g., Windows, MacOS)

For Windows

Click “base”

Download and execute the setup program “R-2.5.1-win32.exe” (latest version) and follow the instructions.

You should be able to accept all the default settings in the setup program.

By default, the software will be placed in C:\ProgramFiles\R\rw2040

For MacOS

Click on the link for R-2.5.1.dmg

Double click on the resulting R icon to install the program

R Commander:

R Commander is the most well known add-on GUI for R that adds menu-driven functionality. R Commander is available for Windows, Linux/Unix, and MacOS. Installation instructions are given at http://socserv.mcmaster.ca/jfox/Misc/Rcmdr/installation-notes.html.