In addition to a great format for visual jokes, Venn diagrams can clearly show overlap between sets. Sets, as in set theory, can be understood as objects belonging to one or more collections. The classic examples in mathematics are natural numbers, integers, rational and real numbers. But sets are everywhere.

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ggplot2 provides sensible default settings for analysis, but when you make charts for a publication, you often need to match an existing style and shift focus to readability over exploration. Design around a message or results instead of leaving interpretation open-ended. Finally, you need to export your charts in the required file format with the correct dimensions and resolution.

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When you want to compare between three parts of your data, ternary plots might be a good option. Here is how to make them. Read More