See also

• Refer to The Split-Apply-Combine Strategy for Data Analysis paper at http://www.jstatsoft.org/v40/i01/paper
• Refer to The Grammar of Graphics, Leland Wilkinson, Springer Science & Business Media
• Refer to the Package 'ggplot2' article from CRAN at http://cran.r-project.org/web/packages/ggplot2/ggplot2.pdf
• Refer to the A Layered Grammar of Graphics article at http://vita.had.co.nz/papers/layered-grammar.pdf