I am a huge fan of Wilkinson's Grammar of Graphics and Hadley's implementation of them in ggplot2. Thanks for sharing this; it helps demo the power of the gramm

I am a huge fan of Wilkinson's Grammar of Graphics and Hadley's implementation of them in ggplot2. Thanks for sharing this; it helps demo the power of the grammar. Since learning GG it has made me think of plotting in an additive fashion instead of before when Excel would do most of it for me and I would often be forced to remove layers I didn't need.