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Voting as Selection of the Most Representative Voter

Speaker: Dr. Ulle Endriss ILLC, University of Amsterdam
Time: 2015-07-03 10:00-2015-07-03 11:00
Venue: FIT 1-222


Voting is the process of choosing a "best" alternative in view of the preferences of a group of voters over a set of alternatives. In this talk I will present recent work based on the following simple idea: todetermine the winner of an election, first identify the "most representative" voter in the group and then implement the will of that voter. I will explore this idea in the context of binary aggregation, where each voter expresses yes/no choices regarding a number of possibly correlated issues  and we  are then asked  to decide  on a collective choice that accurately reflects the views of the group. We will see that certain rules based on our idea, namely the average-voter rule and the majority-voter rule, have surprisingly good properties. In particular, they allow us to approximate the  theoretically attractive but practically intractable distance-based rule up to a small constant factor. I will start the talk with a short general introduction to the field of computational social choice. No specific background in voting theory  will be required to follow the  presentation.

Ulle Endriss        
Institute for Logic, Language & Computation (ILLC)
University of Amsterdam  

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