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Opinion-based optimal group formation

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  • Oliva, Gabriele
  • Scala, Antonio
  • Setola, Roberto
  • Dell’Olmo, Paolo

Abstract

Most of classical decision making processes aim at selecting the “best” alternative or at ranking alternatives based on the opinions of decision makers. Often, such a process occurs among people (experts or decision makers) who are expected to achieve some shared consensus in ranking the alternatives. However, this is not likely to happen (especially for a large and heterogeneous collection of people) and decision makers tend to reveal groups characteristics derived from their different opinions. A major problem is that inconsistency in opinions arises as each expert has a limited knowledge, errors and misinterpretation of data can occur and thus it is not clear how groups can be identified to be internally consistent and non-conflicting. In this paper, we investigate the conditions under which experts can be split into different sub-groups that share coherent and consistent opinions but are mutually in conflict in the ordering of the alternatives. We face this problem by presenting a non-linear integer programming model where each decision maker specifies incomplete preferences on pairs of alternatives and the objective is to obtain groups having the least possible degree of inconsistency. From a theoretical standpoint, we show that the proposed problem is non-convex and NP-Hard. Moreover, we validate the proposed approach with respect to a case study related to the 2018 Italian political elections. Specifically, we analyze the opinions of 33 decision makers and we show that the proposed technique is able to identify sub-groups characterized by large internal consistency, i.e., the members of each sub-groups express similar judgements upon the different options, while such options are evaluated very differently by the different sub-groups. Interestingly, while dividing the decision makers in three sub-groups, we obtain group rankings that reflect the structure of the Italian political parties or coalitions at the time, i.e., left-wing, right-wing and populists, even if such kind of information has not been directly provided by the decision makers nor used within the proposed case study.

Suggested Citation

  • Oliva, Gabriele & Scala, Antonio & Setola, Roberto & Dell’Olmo, Paolo, 2019. "Opinion-based optimal group formation," Omega, Elsevier, vol. 89(C), pages 164-176.
    • Handle: RePEc:eee:jomega:v:89:y:2019:i:c:p:164-176
    DOI: 10.1016/j.omega.2018.10.008
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    3. Meng, Fanyong & Tang, Jie & An, Qingxian, 2023. "Cooperative game based two-stage consensus adjustment mechanism for large-scale group decision making," Omega, Elsevier, vol. 117(C).

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