Read chapter 7 then answer the question one by one Discuss the importance of becoming familiar with the characteristics of the customers in the databases and how the database tracks customer actions. Explain how tabulation techniques are used to understand customers. Provide an example of the proper application of a ratio variable technique. What advantage does a longitudinal variable have in classifying customers? Discuss how direct marketers use correlation analysis. Using direct marketing variables, give examples of positive and negative correlations.