Mining Association Rules With Negative Terms
Using Candidate Pruning
Author(s)
T. Shintani & D. Hayashi
Abstract
In this paper, we discuss an association rule with negative terms that contains negative
and affirmative conditions intermingled, such as \“80% of customers who
buy A and B but do not buy X, also buy C and D”. An association rule with
negative terms can provide higher confidence rules, that is, we can attain more
valuable information. To find them, itemsets containing negative conditions must
be checked. We proposed two candidate pruning methods, upper bound pruning
and database partition pruning, which are suitable for handling these itemsets.
Upper bound pruning detects itemsets that cannot generate rules satisfying userspecified
minimum thresholds. Database partition pruning detects itemsets that
do not appear in database. Through performance evaluations, we show that the
proposed methods not only reduce candidate itemsets but also avoid finding useless
frequent itemsets for rule derivation. Moreover, we show an example of rules
obtained by applying the proposed methods to a real dataset that is the hospitalization
data of the cardiovascular medicine of the University of Tokyo hospital.
Keywords: association rule, negative term, candidate pruning, medical data.
1 Introduction
Mining association rules within a large database is representative problem in data
mining. Several effective algorithms have been proposed[1, 2], but only affirmative
information has been taken into account. In order to apply association rule mining
to more complicated applications, we must consider rules that contain negative
conditions. In [3, 4], negative condition was made consideration in association
rules. [3] introduced a negative association rule X ⇒ Y , such as \“60% of customers
who buy A and B do not buy D”. Furthermore, the other forms of negative
Keywords
association rule, negative term, candidate pruning, medical data.
Related Book
Other papers in this volume
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