Information levels in additive group decision models under incomplete information: Bridging the cardinal ordinal gap

摘要

In the literature, several models for group decision making based on the additive aggregation of groupmembers’ utility or value functions have been proposed (Keeney and Kirkwood 1975; Dyer and Sarin 1979;Keeney and Nau 2011). These group aggregation rules usually are based on systems of axioms very similarto those formulated by Arrow (1963) for the case of aggregating ordinal preferences. In contrast toaggregation of ordinal preferences, aggregation of cardinal alues is thus possible in groups. However, itrequires group members to specify their preferences in cardinal form, by assigning utility scores toalternatives. This could be difficult for group members, in particular if this information should be providedexactly.