Analyzing Exception Rules

M. Delgado, M.D. Ruiz, D. Sánchez

Recent researches have pointed out that associations rules are insufficient for representing the diverse kinds of knowledge collected in a database. Exception rules deal with a different type of knowledge sometimes more useful than simple associations. Moreover exception rules (and other kinds of rules) provide a more comprehensive understanding of the information provided by a database. This work intends to go deeper in the logic model studied in [3]. In the model, association rules can be viewed as general relations between two or more attributes quantified by means of a convenient quantifier. Using this formulation we establish the true semantics and the real formulation of exception rules. We also study the behavior of exceptions when we deal with double rules.

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