LIRa Session: Zoi Terzopoulou

Speaker: Zoi Terzopoulou

Date and Time: Thursday, September 27th 2018, 16:30-18:00

Venue: ILLC Seminar Room F1.15, Science Park 107.

Title: Aggregating Incomplete Pairwise Preferences by Weight.

Abstract. Within the area of Computational Social Choice, we develop a model for the aggregation of preferences that do not need to be either complete or transitive. Our focus is on the normative characterisation of aggregation rules under which each agent has a weight that depends only on the size of her ballot, i.e., on the number of pairs of alternatives for which she chooses to report a relative ranking. We show that for rules that satisfy a restricted form of majoritarianism these weights in fact must be constant, while for rules that are invariant under agents with compatible preferences forming pre-election pacts it must be the case that an agent’s weight is inversely proportional to the size of her ballot.

The talk is based on joint work with Ulle Endriss, and will not require any background on Computational Social Choice.