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I found it's possible to add the lift measure to the quality measures of a frequent itemset in R returned by the Eclat algorithm:

frequentItems <- eclat(trans, parameter = list(supp = support, maxlen = 15))

quality(frequentItems)$lift <- interestMeasure(frequentItems,
                                               measure="lift", trans = trans)

I can't understand how the lift measure is calculated since I know it's related to association rules (antecedent ==> consequent) and not to a frequent itemset.

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