How to Make Symbol-based Glyph Charts, with R Examples
Using geometric shapes as an encoding can provide another dimension to your charts.
Scaled symbols are often used to show multiple variables at a time. I’m thinking bubble charts. The x-y coordinates represent a pair of values and the size of the symbol represents something else. Color can encode another variable.
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Annotating Charts in R
Let the data speak for itself they say. That doesn’t work a lot of the time, and when that happens, you need to explain.
How to Make a Grid Map with Histograms in R, with ggplot
Layout multiple charts in a single view. Then adjust the scales appropriately for maximum comparability and a unified graphic.
R Cheat Sheet and Guide for Graphical Parameters
You can customize graphics in R with
par(), but the docs are mostly text and just organized alphabetically. Here is a more visual reference, categorized by what you can change. Plus, a one-page printout.