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This gives us MIAB=∑i=1gA∑j=1gBnijNln(nijN1ni·N1n·jN)(13) =∑i=1gA∑j=1gBnijNln(nijNni·n·j)(14) for our example: MIAB=15ln(1·51·3)+⋯+05ln(0·51·2)≈.102(15) Because the MI is the shared entropy between two partitions, it can be represented as a Venn Diagram, with circle areas proportional to H(A) and H(B), and the area of overlap between the circles proportional to the mutual information.
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