(1) Install R for your operating system:
 	Windo ws:
		http://cran.at.r-project.org/bin/windows/base/

	Mac OS X:
		http://cran.at.r-project.org/bin/macosx/

	Linux:
		http://cran.r-project.org/bin/linux/

(2) Copy & paste the following commands into the R console and execute them with the enter key:
	install.packages("ggplot2")
	install.packages("lattice")