Essentials erminology Objects rows= records Variables attributes= features a good clustering method high on intra-class similarity and low on inter-class similarity What is similarity? Based on computation of distance Between two numerical attributes Between two nominal attributes Mixed attributes2 Essentials ◼ Terminology: ◼ Objects = rows = records ◼ Variables = attributes = features ◼ A good clustering method ◼ high on intra-class similarity and low on inter-class similarity ◼ What is similarity? ◼ Based on computation of distance ◼ Between two numerical attributes ◼ Between two nominal attributes ◼ Mixed attributes