DIMACS/LAMSADE Workshop on Voting Theory and Preference Modelling

October 25 - 28, 2006
University Paris Dauphine, France

Organizers:

Denis Bouysso, CNRS-Lamsade, bouyssou@lamsade.dauphine.fr

Mel Janowitz, DIMACS, melj@dimacs.rutgers.edu

Fred Roberts, DIMACS, froberts@dimacs.rutgers.edu

Alexis Tsoukiàs, LAMSADE, tsoukias@lamsade.dauphine.fr

Philippe Vincke, SMG, pvincke@ulb.ac.be

DIMACS/LAMSADE PARTNERSHIP on Computer Science and Decision Theory: Applications of Notions of Consensus

LAMSADE Website

LAMSADE Working Group Website

Workshop Program:

Wednesday, October 25, 2006

 8:30 -  9:00 Registration

 9:00 -  9:15 Opening session

 9:15 - 10:45 Tutorial Session 1 (Chair: Denis Bouyssou)
              Computer Science and Decision Making 
              Fred Roberts, DIMACS 

10:45 - 11:00 Coffee break

11:00 - 12:30 Tutorial Session 2 (Chair: Denis Bouyssou)
              Behavioral Social Choice: Probabilistic Models, 
              Statistical Inference, and Application
              Mike Regenwetter

12:30 -  2:30 Lunch

 2:30 -  4:00 Tutorial Session 3 (Chair: Fred Roberts)
              Using Mathematics to Explain Surprises in Voting Theory
              Donald Saari 
 
 4:00 -  4:30 Coffee break

 4:30 -  6:00 Tutorial Session 3 (Chair: Fred Roberts)
              Voting Systems That Combine Approval and Preference
              Steve Brams 

 6:00 -  7:30 Welcome drink

Thursday, October 26, 2006

 8:30 - 10:00 Tutorial Session 5 (Chair: Stefan Pickl)
              A Conjoint Measurement View on Fuzzy Integrals
              Denis Bouyssou, Thierry Marchant, Marc Pirlot 
 
10:00 - 10:15 Coffee break

10:15 - 12:30 Session 1 (Chair: Donald Saari)
              Removal Independence for ß-closed Systems of Sets 
              Gary D. Crown. Melvin F. Janowitz, R.C. Powers 
  
              Condorcet Domains and Distributive Lattices
              Bernard Monjardet 

              Consensus Hierarchies Defined by Decisive Families
              Robert C. Powers, Buck McMorris

12:30 -  2:00 Lunch

 2:00 -  3:30 Session 2 (Chair: Steve Brams)
              Approval Voting: Three Examples
              Francesco De Sinopoli, Bhaskar Dutta and Jean-Francois Laslier 
            
              Approval Voting for Committees: Threshold Approaches
              Peter Fishburn, Aleksandar Pekec 

 3:30 -  4:00 Coffee break

 4:00 -  6:15 Session 3 (Chair: Jean-Francois Laslier)
              On the Difficulty of Computing the Winners of a Tournament
              Olivier Hudry

              Vote and Aggregation in Combinatorial Domains with Structured Preferences 
              Jérôme Lang 

              Preference Aggregation and Elicitation: Tractability in the 
              Presence of Incompleteness and Incomparability 
              M.S. Pini, F.Rossi, K. Venable, T. Walsh 

Friday, October 27, 2006

 8:30 - 10:00 Session 4 (Chair: Michel Grabisch)
              Collective Decision Making Using GAI Networks
              C. Gonzales, P. Perny, S.Queiroz
              
              Reasoning about Controllable and Uncontrollable Variables
              Souhila Kaci and Leendert van der Torre 

10:00 - 10:15 Coffee break

10:15 - 12:30 Session 5 (Chair: Thierry Marchant)
              A Minimax Procedure for Electing Committees
              Steve Brams, Marc Kilgour and Remzi Sanver

              An Axiomatic Characterization of the Prudent Order Preference Function 
              Claude Lamboray 
  
              The Unexpected Empirical Consensus among Consensus Methods
              Mike Regenwetter

12:30 -  2:30 Lunch

 2:30 -  4:00 Session 6 (Chair: Olivier Hudry)
              Multilayered Decision Problems
              Dmitrii Lozovanul, Stefan Pickl

              Some Comments on Strategic Voting 
              Eric Pacuit, Rohit Parikh 

 4:00 -  4:30 Coffee break

 4:30 -  6:00 Session 7 (Chair: Mike Regenwetter)
              The Polyhedron of all Representations of a Semiorder
              Barry Balof, Jean-Paul Doignon and Samuel Fiorini

              On Influence and Power Indices 
              Michel Grabisch, Agnieszka Rusinowska 

              A Simple Bayes Factor for Testing Measurement-Theoretic Axioms 
              Thierry Marchant 
  
              Dinner

Saturday, October 28, 2006

 8:30 - 10:00 Session 8 (Chair: Jérôme Lang)
              Geometric Approach to Paradoxes of Voting Power
              Michael Jones

              New Results on Intervals Comparison
              Meltem Öztürk, Alexis Tsoukiàs

10:00 - 10:15 Coffee break

10:15 - 12:30 Session 9 (Chair: Alexis Tsoukiàs)
              On Enumerating the Kernels in a Bipolar-Valued Outranking Digraph
              Raymond Bisdorff 

              Better Ways to Cut a Cake
              Steve Brams, Michael Jones and Christian Klamler

              Expressive Power of Weighted Propositional
              Formulas for Cardinal Preference Modelling             
              Yann Chevaleyre, Ulle Endriss, Jérôme Lang 
 

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