How to Make a Connected Scatter Plot
The combination of a time series chart and a scatter plot lets you compare two variables along with temporal changes.
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Stacked area charts let you see categorical data over time. Interaction allows you to focus on specific categories without losing sight of the big picture.
A Course for Visualizing Time Series Data in R
Learn to visualize temporal patterns in a couple of days.
How to map connections with great circles
There are various ways to visualize connections, but one of the most intuitive and straightforward ways is to actually connect entities or objects with lines. And when it comes to geographic connections, great circles are a nice way to do this.