Here is a nice ppt file to demonstrate ggplot2. http://cos.name/wp-content/uploads/2012/05/3-xiaokai-ggplot2.pdf Here is a reference book about ggplot2. http://www.it-ebooks.info/book/1316/
If you can't explain it simply, you don't understand it well enough. –Albert Einstein
Here is a nice ppt file to demonstrate ggplot2. http://cos.name/wp-content/uploads/2012/05/3-xiaokai-ggplot2.pdf Here is a reference book about ggplot2. http://www.it-ebooks.info/book/1316/