Data Mining (Cont.) Descriptive Patterns Associations Find books that are often bought by "similar"customers.If a new such customer buys one such book,suggest the others too. Associations may be used as a first step in detecting causation E.g.,association between exposure to chemical X and cancer, Clusters E.g.,typhoid cases were clustered in an area surrounding a contaminated well Detection of clusters remains important in detecting epidemics Database System Concepts-6th Edition 20.12 @Silberschatz,Korth and SudarshanDatabase System Concepts - 6 20.12 ©Silberschatz, Korth and Sudarshan th Edition Data Mining (Cont.) Descriptive Patterns Associations  Find books that are often bought by “similar” customers. If a new such customer buys one such book, suggest the others too. Associations may be used as a first step in detecting causation  E.g., association between exposure to chemical X and cancer, Clusters  E.g., typhoid cases were clustered in an area surrounding a contaminated well  Detection of clusters remains important in detecting epidemics