Small Multiples in R
Make a lot of charts at once, line them up in a grid, and you can make quick comparisons across several categories.
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How to Make Gridded Maps
For when your geographic data is evenly spread rather than aggregated by government boundaries.
How to visualize data with cartoonish faces ala Chernoff
The goal of Chernoff faces is to show a bunch of variables at once via facial features like lips, eyes, and nose size. Most of the time there are better solutions, but the faces can be interesting to work with.
How to Make a Contour Map
Filled contour plots are useful for looking at density across two dimensions and are often used to visualize geographic data. It’s straightforward to make them in R — once you get your data in the right format, that is.