I have a dataset containing information about movies and their genres.
From the dataset I have generated association rules from the frequent itemsets that I have mined using the Apriori algorithm.
From that I have found some interesting association rules and now I want to evaluate how useful they are.
As an example, I have found the following rules:
- Rule A: Romance, War -> Drama (support: 0.006, confidence: 0.863)
- Rule B: Drama -> Romance, War (support: 0.006, confidence: 0.012)
From this I calculate the Kulczynski measure to be 0.4375.
Furthermore, using the following itemsets I can calculate the IR:
- Itemset A: Romance, War (support: 0.007)
- Itemset B: Drama (support 0.489)
- Itemset A⋃B = Drama, Romance, War (support: 0.006)
IR(A,B) = 0.9836
All in all this shows that the data is heavily skewed (which is to be expected, since Drama is a very common genre compared to Romance and War) and that the itemsets are neutral or maybe slightly negatively associated.
The question then comes down to: What does this tell me about the "value" of the rules? How does the two measures go hand in hand to evaluate the rules?