ggplot2

This new edition to the classic book by ggplot2 creator Hadley Wickham highlights compatibility with knitr and RStudio. ggplot2 is a data visualization package for R that helps users create data graphics, including those that are multi-layered, with ease. With ggplot2, it's easy to:  * produce handsome, publication-quality plots with automatic legends created from the plot specification * superimpose multiple layers (points, lines, maps, tiles, box plots) from different data sources with automatically adjusted common scales * add customizable smoothers that use powerful modeling capabilities of R, such as loess, linear models, generalized additive models, and robust regression * save any ggplot2 plot (or part thereof) for later modification or reuse * create custom themes that capture in-house or journal style requirements and that can easily be applied to multiple plots * approach a graph from a visual perspective, thinking about how eachcomponent of the data is represented on the