Graphs There are many ways of making the same kinds of graphs in R, each with its advantages and disadvantages. The focus here is on the ggplot2 package, which uses a "grammar of graphics" to design graphs, rather than the usual procedural methods. Graphs with ggplot2 Bar and line graphs (ggplot2) Plotting means and error bars (ggplot2) Plotting distributions (ggplot2) - Histograms, density curves