Question

What is the difference between matching coefficient and jaccards coefficient? Can you provide an that applies...

What is the difference between matching coefficient and jaccards coefficient? Can you provide an that applies to both? I am confused about the intuition behind these two coefficients .

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Answer #1

When used for binary attributes, the Jaccard index is very similar to the simple matching coefficient. The main difference is that the SMC has the term M00 in its numerator and denominator, whereas the Jaccard index does not. Thus, the SMC counts both mutual presences (when an attribute is present in both sets) and mutual absence (when an attribute is absent in both sets) as matches and compares it to the total number of attributes in the universe, whereas the Jaccard index only counts mutual presence as matches and compares it to the number of attributes that have been chosen by at least one of the two sets.

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