Magnum Opus finds two forms of pattern: rules and itemsets. A Magnum Opus itemset is a set of attribute values or items. The search options enable the user to control the types of itemset that are found. By default, Magnum Opus finds itemsets that maximize leverage.
A number of measures are listed with each itemset:
| Coverage | The proportion of examples covered by the itemset. |
| Leverage | The proportion of examples covered by the itemset in excess of the maximum that can be explained by assuming independence between any subsets of the itemset. |
Magnum Opus supports two itemset formats. The detailed format incorporates a brief description of each measure and is recommended for first-time users. The concise format provides a more concise description of each itemset and is intended for experienced users.
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