The telecommunications industry generates and stores a tremendousamount of data (Han et al, 2002). These data include call detail data, which describes the callsthat traverse the telecommunication networks, network data, which describesthe state of the hardware and software components in the network, andcustomer data, which describes the telecommunication customers (Roset et al, 1999). Theamount of data is so great that manual analysis of the data is difficult, if notimpossible.
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