This paper deals with the identification of a minimal set of tests and diagnostic procedures allowing for a diagnosis of acute appendicitis with a reasonable accuracy. In order to create such a set of tests, which we call a diagnostic check list, we are using the rough sets methodology developed for a discovery of knowledge from imprecise data. This methodology is applied to data gathered from a retrospective chart study of emergency room admissions of patients with abdominal pain at the Children’s Hospital of Eastern Ontario. Empirical investigation of historical data reveals that the diagnostic process in an emergency room setting should be improved if the proposed diagnostic check list is used
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