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Which Null-Invariant Measure Is Better?
- IR (Imbalance Ratio): measure the imbalance of two itemsets A and B in rule implications
\[ IR(A,B) = \frac {|sup(A)-sup(B)|} {sup(A)+sup(B)-sup(AUB)}\]
- Kulczynski and Imbalance Ratio (IR) together present a clear picture for all the three datasets D4 through D6
- D4 is balanced & neutral
- D5 is imbalanced & neutral
- D6 is very imbalanced & neutral

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