4.3 Search Strategy

The Search strategy option lets you select the measure to prioritize the associations discovered. (See Figure 4.4 .) You can use Leverage, Lift, Coverage, Support, and Confidence (Associations) (explained in Figure 4.4 ), so rules with higher values for the measure chosen will be prioritized.

By default the search strategy is leverage since it is one of the measures that gives relevant results in most cases. By choosing leverage, you will find associations of items that occur more frequently in your dataset. Another popular measure is lift. By choosing lift as your search strategy, you will find associations of less frequent items in your dataset, but strongly related with each other. The strategy you choose should be coherent with your application.