Nowadays, the need to stay ahead of the competencies is one of the company's focus. In an effort to stay afloat in the competitive conditions, companies can perform a variety of information technology development. One of the information technologies that are currently being intensively developed is the use of Data Mining. Data Mining provides benefits to process data into useful information for a company. The main pont of the research on this journal is to establish data mining models to identify TelkomFlexi postpaid customers who have the possibility to move to another provider (churn analysis).Churn analysis is done so that the company can choose the most appropriate strategy in retaining customers. Type of data mining is used to churn analysis is classification.
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