Example 7.28: Bubble plots

March 22, 2010
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(This article was first published on SAS and R, and kindly contributed to R-bloggers)

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/

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