Learning Data Mining with Python - Second Edition

Extracting association rules

After the Apriori algorithm has completed, we have a list of frequent itemsets. These aren't exactly association rules, but they can easily be converted into these rules. A frequent itemset is a set of items with a minimum support, while an association rule has a premise and a conclusion. The data is the same for the two.

We can make an association rule from a frequent itemset by taking one of the movies in the itemset and denoting it as the conclusion. The other movies in the itemset will be the premise. This will form rules of the following form: if a reviewer recommends all of the movies in the premise, they will also recommend the conclusion movie.

For each itemset, we can generate a number of association ...