ABSTRACTOutliersareabnormalinstancesorobservations.DetectingdataoutliersisaveryimportantconceptinKnowledgedatadiscovery.Outlierdetectionhasbeenstudiedinthecontextofalargenumberofresearchareaslikelargedistributedsystems,datamining,wirelesssensornetworks(WSN),healthmonitoring,environmental