Paap, Richard; Franses, Philip Hans; Donkers, Bas; … - In: Journal of Applied Econometrics 21 (2006) 5, pp. 549-562
The selection of the most profitable customers in a customer database for targeted activities is often done based on observed behaviour in the past. Consequently, databases arising from the responses to, for example, direct mailings in the past are not random samples. When not all heterogeneity...