Before revision:  The survey data contains consumer given information on the current and previous brand of the phone and the times of the last two purchases . In contrast to personal purchase histories stored in a customer registry of a company, the survey provides information also on the purchase behavior of the customers of the competitors. The proposed framework systematically takes into account the prior information and the sampling variance of the survey data and by using Bayesian statistics quantifies the uncertainty of the CE and CLV estimates by posterior distributions. The introduced approach is directly applicable in the domains where a customer relationship can be thought to be monogamous .
After revision:  The survey data contains consumer given information on the current and previous brand of the phone and the times of the last two purchases .