In case of on-line retailing, in addition to collecting what customers buy, retailers can collect information on what customers look at during the shopping process. This process provides a detailed understanding of customer's preference. ... Data mining, which can be used to examine the behavior of customers in the period leading up to an apparent defection, can analyze and model sales patterns and how they vary with store demographics, time of year, economic climate, weather, promotions and many other factors. ...

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