Journal
IEEE TRANSACTIONS ON FUZZY SYSTEMS
Volume 30, Issue 3, Pages 638-648Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TFUZZ.2020.3042611
Keywords
Decision making; Proposals; Mathematics; Aggregates; Smart cities; Organizations; Indexes; Aggregation; decision-making; general means; ranking; ranking optimality; score functions; social choice
Funding
- MINECO/AEIFEDER, UE [ECO2015-65031-R, MTM2015-63608-P]
- MINECO/AEI-FEDER, UE [TIN2016-77356-P]
- AEI [PID2019-108392GB-I00]
- Brazilian National Council for Scientific and Technological Development CNPq [307781/2016-0]
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The article analyzes different theoretical and normative methods of aggregating individual rankings. It introduces the concept of a general mean and discusses the construction of ranking fusion functions. The study shows that any ranking fusion function introduces a partial order on rankings, allowing for comparison of different methods of aggregation.
Throughout this article, our main idea is to analyze from a theoretical and normative point of view different methods to aggregate individual rankings. To do so, first, we introduce the concept of a general mean on an abstract set. This new concept conciliates the social choice-where well-known impossibility results as the Arrovian ones are encountered-and the decision-making approaches-where the necessity of fusing rankings is unavoidable. Moreover, it gives rise to a reasonable definition of the concept of a ranking fusion function that does indeed satisfy the axioms of a general mean. Then, we will introduce some methods to build ranking fusion functions, paying a special attention to the use of score functions, and pointing out the equivalence between ranking and scoring. To conclude, we prove that any ranking fusion function introduces a partial order on rankings implemented on a finite set of alternatives. Therefore, this allows us to compare rankings and different methods of aggregation, so that in practice, one should look for the maximal elements with respect to such orders defined on rankings.
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