The association rule learner* searches for frequent itemsets meeting the user-defined minimum support
criterion and, optionally, creates association rules from them.
The column containing the bitvectors has to be selected. The minimum
support as an absolute number must be provided (therefore check the number
of transactions to obtain a sensible criterion). If the frequent itemsets
should be free (unconstrained) or closed or maximal has also be defined.
Closed itemsets are frequent itemsets, which have no superset with the
same support, thus providing all the information from free itemsets
in a compressed form. Maximal itemsets are itemsets which have no
frequent superset at all. The maximal itemset length must also be
defined. If only frequent itemset are mined (and no association rules
generated) the output can be sorted by support of the itemsets or their
length. If association rules are generated a confidence value has to be
provided. The confidence is a value to define how often the rule is
right. Association rules generated here are in the form to have only one
item in the consequence.
The underlying data structure can be either an ARRAY or a TIDList.
Choose the former when there are many transactions an less items, and
the latter if the structure of the input data is vice versa.
(*) RULE LEARNER is a registered trademark of Minitab, LLC and is used with Minitab’s permission.
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