A Venn diagram (also called primary diagram, set diagram or logic diagram) is a diagram that shows all possible logical relations between a finite collection of different sets. Each set is represented by a circle. The
circle size represents the importance of the group. The groups are usually overlapping: the size of the overlap represents the intersection between both groups. It is unadvised to make Venn diagram with more than 3
groups because it would become hard to read. R has a specific library allowing to make Venn diagram.
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