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Practical Predictive Analytics by Ralph Winters

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Examining the rules quality and observing the highest support

The quality measures tell you something about the distribution of support, confidence, and lift. The quality function will give the support, lift, and confidence for each of the rules. You can also sort the rules by each of these important measures and observe which rules have the highest measures.

We can see from the low support distribution that there are no particular itemsets that occur more than others. If you inspect the rules sorted by the support level, you will see the highest support level at 0.046. Notice that this agrees with the Max. support level given in the summary. The top three support levels are for those customers who purchase holders, boxes, or signs:

 summary(rulesx) ...

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