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Practical Predictive Analytics by Ralph Winters

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Left censoring

In a marketing context, studies usually begin with customers already in place, and without any knowledge of how they were acquired.

Additionally, not all customers start at the same time. When a customer has started prior to the beginning of a study or analysis, some customer attributes can be referred to as left censored. If you start an analysis that includes all of your customers, you will not have knowledge of some of the events that preceded the start of the study. This knowledge may include very important information, such as customer dissatisfaction with a prior customer policy that was implemented way before the start of the study, but there is not much we can do about it if we don't have the information. In a survival ...

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