In this study a collection of six different regression models were estimated and
validated. As presented above each time step had two samples, one with a
churner/nonshurner ratio 1/1 and the other with a ratio 2/3. Three time periods (t =
4, 6, 8) were selected for the logistic regression analysis. This produced six
regression models which were validated by using data sample 3 (115 000
customers with the current account indicator). The data for validation was
collected from time periods t(9) – t(11).