A conditional pattern base collects the prefix paths and counts leading to a selected item in a frequent pattern tree. It supports extracting patterns for that item. section 4.6
Construct one by tracing every path from the root to the selected item, removing the NULL root, and recording each prefix with the item's count. Aggregate repeated prefixes, discard counts below the minimum support, form the conditional F-P tree, then append the original item. section 4.6
Cheese
Cheese appears through Milk-Cheese and Milk-Apples-Cheese, producing {{Milk:1}, {Milk-Apples:1}}. Aggregation gives Milk:2 and Apples:1; with minimum support count 2, retain {Milk:2} and generate {Milk-Cheese:2}. section 4.6
