R is a programming language and software environment for statistical computing and graphics. The R language is widely used among statisticians for developing statistical software, and R is widely used for statistical software development and data analysis.

• How to install R
• Windows Users
• Go to the web site and download R for windows
• Click on the downloaded file and begin installation
• When asked where to install R, never never never never .... accept the default, instead create a new folder in the C: and name it for example R-your-name, even you can select a USB drive or flash disk. Select this folder as your destination folder. Do not forget the golden rule of never creating spaces in the folder names.
• Contue the installation process
• After complete installation, run R and update packages by entering the following in the R console
• update.packages()
• click enter
• select cran mirror by your mouse (I prefere Germany Berlin)
• wait for the update process to finish
• Proceed to install a graphic user interface for R (See later)
  
• Linux Users
  
• Straight forward, go to synaptic package manager, write "r-base" in the search bar, right click on it, then select for installation
• GUI for R

• R is a difficult program particularly for me as I am neither a statistician nor a mathematician, therefore, to use R, I need a GUI (Graphical User Interface). So that R looks more like SPSS or other commercial software. There are many GUIs for R, but the two most useful (at least for me) are R commander and JGR (prounonced as jaguar).

• R Commander
• In the R console write "install.packages("Rcmdr")" without the external quotas
• Select cran mirror and proceed in the installation
• After finishing installation type "liberary(Rcmdr)"
  
• JGR
• Install sun java jdk
  sudo R CMD javareconf
  sudo R ## Necessary to install these packages system-wide (I suppose)
  install.packages("JGR",dep=T)
  library(JGR) ## Load JGR
  JGR()