bar chart grouped bar chart Alejandra Gonzalez-Beltran Philippe Rocca-Serra Orlaith Burke adapted from http://www2.le.ac.uk/offices/ld/resources/numeracy/bar-charts and http://blog.visual.ly/how-groups-stack-up-when-to-use-grouped-vs-stacked-column-charts/ [last accessed: 2014-03-04] barplot(height....) set argument " beside = TRUE " http://stat.ethz.ch/R-manual/R-patched/library/graphics/html/barplot.html grouped bar chart is a kind of bar chart which juxtaposes the discrete values for each of the possible value of a given categorical variable, thus providing within group comparison. Grouped bar charts are good for comparing between each element in the categories, and comparing elements across categories. However, the grouping can make it harder to tell the difference between the total of each group. ready for release