Bubble chart
A bubble chart is actually an XY (scatter) chart with a variable size dot marker. Some even consider it as an XYZ chart, which helps you visualize the relationship between three different variables.
Just like a scatter chart, you can only plot true numerical values and it is best to have them arranged as an X series before the Y series before the third (Z) series. The following screenshot shows a bubble chart for ice cream sales against temperature, and is inclusive of a third series, average order quantity:
Figure 8.31 – Bubble chart of ice cream sales and order size by temperature
The major concern with a bubble chart is whether the audience will understand the interpretation easily. If you have an unsophisticated audience and you won’t be there to explain the charts to them, you might want to use another easier-to-read chart.
And that’s it about bubble charts; they are very much like scatter charts, so all we...
