definition of Support

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Jan 4, 2021, 11:20:08 PM1/4/21

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I am a bit confused by the definition of Support. According to this link http://rasbt.github.io/mlxtend/user_guide/frequent_patterns/association_rules/, it has support(A→C)=support(A∪C)

Shouldn't it be the intersection of event A and event C? The above equation seems to suggest that it is the union of the two events.

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Jan 5, 2021, 11:36:08 AM1/5/21

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Good point. I think the current notation is correct although it is confusing.

This is because confidence(A -> C) = support(A->C) / support(A). And this is usually also written as confidence(A->C) = support(A U C) / support(C)

Best,

Sebastian

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Jan 5, 2021, 11:46:16 AM1/5/21

to mlxtend

Thanks. But my confusion is about support, not confidence. Could you please comment about support? Thanks again.

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