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Table Of Contents
Data Analysis Using SQL and Excel - Second Edition
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The rest of this chapter explores and explains various calculations used in survival analysis, with particular emphasis on using SQL and Excel to do them. The examples in the rest of the chapter use the subscription dataset, which consists of customers of a mobile phone company in three markets.
The hazard calculation is the foundation of survival analysis, and it depends on the start date, stop date, and stop type columns. This section first explores these columns and then goes into the calculation of the hazard itself.
Survival analysis fundamentally relies on two pieces of information about each customer, the stop flag (whether the customer is stopped or active) and the tenure (how long the customer was active). Often, these columns must be derived from other columns in the database. In Subscribers, for instance, the tenure is already calculated but the stop flag must be derived from other columns.
Because this information is so important...
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