Tip. Stephen Few suggests using 2 side-by-side horizontal bar graphs to demonstrate an association between measures when readers may be unfamiliar with scatter plots (Few 2012). Each bar graph displays the data values for one of the measures, and the 2 graphs will thus use different scales for the y axis. Position the bars on each graph so that coordinating data points are aligned – for example, child A’s height on the left graph is aligned with child A’s weight on the right graph. Ordering the bars by size on one of the graphs (typically the left graph) will emphasise the correlation between the 2 measures.