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Exercise

Confidence and lift measures

You are now ready to calculate the confidence and lift measures for different rules. This will enable you to get a feeling for the likelihood and the degree of confidence of various association rules.

You need to make sure to only look at the first few records of extracted rules as the number of rules can be very large. Having the possibility of sorting rules according to a specific metric is definitely a must.

The transactional object Online_trx is loaded in the workspace.

Instructions 1/4
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  • 1

    Call the apriori() function with minimum support of 0.01 and confidence 0.4.

    • 2

      Call the apriori() function with minimum support of 0.01 and confidence 0.4 and disallow rules with empty sets.

    • 3

      Inspect the five first rules after sorting them by confidence.

    • 4

      Inspect the five first rules after sorting them by lift.

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