Availability (Cross-Effects) Designs
To this point, the experimental designs discussed have been for situations in which respondents rate a single prole or pick a single prole from a choice set. When collecting stated choices using discrete choice experimentation (DCE), however, respondents are given multiple-choice sets of varying size and composition, and it is likely that the composition of the set will inuence the attractiveness of the alternatives within the set. When modeling preferences for alternatives and combinations of alternatives selected from choice sets having differing compositions, it sometimes is desirable that the model accommodate the fact that the values of alternatives may be affected by the presence of other alternatives in the choice set. Such effects are referred to as cross effects.