The supermarket dataset, located in datasets/chap5/supermarket.arff, describes the shopping habits of supermarket customers. Most of the attributes stand for a particular item group, for example, diary foods, beef, potatoes; or department, for example, department 79, department 81, and so on. The following image shows an excerpt of the database, where the value is t if the customer had bought an item and missing otherwise. There is one instance per customer. The dataset contains no class attribute, as this is not required to learn association rules. A sample of data is shown in the following table: