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A bubble plot is a means of displaying 3 variables in a scatterplot. The z dimension is presented in the size of the plot symbol, typically a circle. The area or radius of the circle plotted is proportional to the value of the third variable. This can be a very effective data presentation method. For example, consider Andrew Gelman’s recent re-presentation of health expenditure/survival data/Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
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