I am trying to design a discrete choice study. I have 2 variables each with 3 ordered levels. I have followed the “Discrete ChoiceDesigns” tutorial and used data from a preliminary pilot experiment to specifythe prior mean and variance matrix to indicate the order of the variablelevels. Nonetheless, the DoE module produces choice sets that are completely dominated, that is, one choice has all the best features and the other choicehas all the worst features. This is clearly not useful for the analysis.
Any help would be appreciated understanding what is going on.