Base graphics and ggplot2
There are lots of user-contributed graphics packages in R that can produce some wonderful graphics. You may wish to take a look for yourself at the CRAN task view cran.r-project.org/web/views/Graphics.html. We will have a very quick look at two approaches: base graphics, so-called because it is the default graphical environment within a vanilla installation of R, and ggplot2, a highly popular user-contributed package produced by Hadley Wickham, which is a little trickier to master than base graphics, but can very rapidly produce a wide range of graphical data summaries. We will cover two graphs familiar to all, the bar chart and the line chart.
Bar chart
Useful when comparing quantities across categories, bar charts are ...
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