Compute the interest measure for the association pattern {a, b}. De- scribe the nature of the relationship between item a and item b in terms of the interest measure.
Suppose we have market basket data consisting of 100 transactions and 20
items. If the support for item a is 25%, the support for item b is 90% and the
support for itemset {a, b} is 20%. Let the support and confidence thresholds
be 10% and 60%, respectively.
The interest measure is 0.2/(0.25 × 0.9) = 0.889. The items are nega-
tively correlated according to interest measure.
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