Deun, K. van; Groenen, P.J.F.; Delbeke, L. - Erasmus University Rotterdam, Econometric Institute - 2005
In this paper, we propose a new model that combines the vector model and the ideal point model of unfolding. An algorithm is developed, called VIPSCAL, that minimizes the combined loss both for ordinal and interval transformations. As such, mixed representations including both vectors and ideal...