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2015-15

Partial-profile choice designs for estimating main and interaction effects of two-level attributes from paired comparison data

by Großmann, H..


Series: 2015-15, Preprints

MSC:
62K05 Optimal designs

Abstract:
A new method to generate designs for estimating main effects and two-factor interactions of two-level attributes from choice experiments is presented for the situation where the choice sets are pairs and the alternatives are specified by a subset of the attributes. Partial-profile designs are constructed by using Hadamard matrices, factorial and incomplete block designs as building blocks. Their information matrix in the multinomial logit model is derived under the indifference assumption of equal choice probabilities by using the relationship between the multionimal logit model for pairs and the linear paired comparison model. The information matrix depends only on the incomplete block designs but not on the other building blocks. Efficient partial-profile designs with relatively small numbers of choice sets are found by performing computer searches which are inspired by these results.

Keywords:
Choice experiments, Multionomial logit model, Paired comparisons, Partial profiles, Design construction