2012 Volume 39 Issue 1 Pages 75-90
We propose to use the mixed effect trend vector model for modeling of repeated multinomial choice data in the form of a square contingency table. Such data often shows asymmetries where more people change from category a to b than the other way around. In many cases an investigator has, besides the actual choices of the participants, auxiliary variables that pertain to the subjects under study. Most methodologies for asymmetric data do not take into account such variables. We will show how to incorporate these auxiliary variables into the mixed effects trend vector model and how they can be used to study differential change. The models are illustrated in detail with data from the Dutch parliamentary election studies 2006.
