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Advisor(s)
Abstract(s)
We present a comprehensive computational study on the effects of providing different forms of
incomplete preference information in additive group decision models. We consider different types of
information on individual preferences, and on weights of the group members, and study their effects on
conclusiveness, ef
fi
ciency and fairness of outcomes at the group level. Furthermore, we analyze possible
violations of the axiom of independence of irrelevant alternatives (IIA) as well as the impact of problem
characteristics, in particular initial agreement between group members. Our results indicate that
providing information in the form of a ranking of differences between consecutive alternatives comes
close to providing exact cardinal preference information in several outcome dimensions. However, group
decision procedures based on incomplete preference information also show a significant amount of
violations of the IIA axiom.
Description
Keywords
Additive group utility Incomplete information Ordinal preference information Independence of irrelevant alternatives