Thierry Marchant. Thierry.Marchant@UGent.be Affiliation : Professor at Ghent University from February 2000, in the department of data analysis.

Former positions :

Research :

• Axiomatic foundations of multicriteria decision aiding.
• Voting theory with specific interest for the Borda method and scoring methods. Axiomatic and probabilistic aspects.
• Measurement theory.
• Decision under uncertainty.
• Bibliometrics.

Books :

• Bouyssou, D., Marchant, T., Pirlot, M., Tsoukias, A. and Vincke P. Evaluation and Decision models with multiple criteria : stepping stones for the analyst, Springer, 445 pp. (2006).
• Bouyssou, D., Marchant, T., Perny, P., Pirlot, M., Tsoukias, A. and Vincke P. Evaluation and Decision models : a critical perspective, Kluwer, 288 pp. (2000).

Special issue :

• Marchant, T. and Pirlot, M. (2021), Special issue on multiple criteria sorting methods. Journal of Multi-Criteria Decision Analysis, 28: 129-130. https://doi.org/10.1002/mcda.1760

Articles :

• Bouysou, D., Marchant, T. and Pirlot, M., "ELECTRE TRI-nB, pseudo-disjunctive: axiomatic and combinatorial results", Theory and Decision, (2025). (Preliminary version)
• Marchant, T. and Sen, A., "Stochastic Choice with Bounded Processing Capacity", Journal of Mathematical Psychology, 14 (2023). (Preliminary version)
• Bouysou, D., Marchant, T. and Pirlot, M., "A theoretical look at ELECTRE TRI-nB and related sorting models", 4OR, 21, 1-31 (2023). (Preliminary version)
• Bouysou, D., Marchant, T. and Pirlot, M., "A note on ELECTRE TRI-nB with few limiting profiles", 4OR, 20, 443-463 (2022). (Preliminary version)
• Bouysou, D., Marchant, T. and Pirlot, M., "Axiomatic characterization of the chi squared dissimilarity measure", Aequationes mathematicae, 96, 307-323 (2022). (Preliminary version)
• Bouysou, D., Marchant, T. and Pirlot, M., "The size of the maximum antichains in products of linear orders", TOP, 29(3), 648-659 (2021). (Preliminary version)
• Bouysou, D., Marchant, T. and Pirlot, M., "An axiomatic characterization of two disproportionality and malapportionment indices: the Duncan and Duncan index and the Lijphart index", Annals of Operations Research, 284, 147-163 (2020). (Preliminary version)
• Lorenzoni, V., Staley, J., Marchant, T., Onderdijk, K. E., Maes, P.-J. and Leman, M., "The sonic instructor: a music-based biofeedback system for improving weightlifting technique", PLOS ONE, 14, 8 (2019). Open access.
• Marchant, T., "Utilitarianism without individual utilities", Social Choice and Welfare, 53, 1-19 (2019). (Preliminary version)
• Lorenzoni, V., De Bie, T., Marchant, T., Van Dyck, E. and Leman, M., "The effect of (a)synchronous music on runners' lower leg impact loading", Musicae Scientiae, 23, 332-347 (2019). (Open access)
• Gravel, N., Marchant, T. and Sen, A., "Conditional Expected Utility Criteria for Decision Making under Ignorance or Objective Ambiguity", Journal of Mathematical Economics, 18, 79-95 (2018). (Preliminary version)
• Marchant, T. and Mishra, D., "The characterization of affine maximizers on restricted domains with two alternatives", European Journal of Operations Research, 266, 3, 1038-1043 (2018). (Preliminary version)
• Allard, D. and Marchant, T., "Means and covariance functions for geostatistical compositional data: an axiomatic approach", Mathematical Geosciences, 50, 3, 299-325 (2018). (Preliminary version)
• Bouysou, D. and Marchant, T., "The beta-ranking and the beta-measure for directed networks: axiomatic characterizations", Social Networks, 52, 145-153 (2018). This version of the text contains an unfortunate error in Theorem 2. It was pointed out to us by Yan-An Hwang in the following note. The following amended version incorporates the suggestion of the referee, that we deem superior, and is fully self contained. We apologize to the readers for the inconvenience.
• Bouysou, D. and Marchant, T., "Ranking authors using fractional counting of citations: An axiomatic approach", Journal of Informetrics, 10, 183-199 (2016). (Preliminary version)
• Bouysou, D. and Marchant, T., "Bi-semiorders with frontiers on finite sets", Journal of Mathematical Psychology, 66, 6-15 (2015). (Preliminary version)
• Fonteyne, L., De Fruyt, F., Dewulf, N., Duyck, W., Erauw, K., Goeminne, K., Lammertyn, J., Marchant, T., Moerkerke, B., Oosterlinck, T. and Rosseel, Y., "Basic mathematics test predicts statistics achievement and overall first year academic success", European Journal of Psychology of Education, 30, 95-118 (2015).
• Bouyssou, D. and Marchant, T., "On the relations between ELECTRE TRI-B and ELECTRE TRI-C and on a new variant of ELECTRE TRI-B", European Journal of Operational Research, 242, 201-211 (2015). (Preliminary version)
• Vrijdags, A. and Marchant, T., "From Uniform Expected Utility to Uniform Rank-Dependent Utility: An Experimental Study", Journal of Mathematical Psychology, 64-65, 76-86 (2015). (Preliminary version)
• Marchant, T., Mishra, D. "Mechanism design with two alternatives in quasi-linear environments" Social Choice and Welfare, 44, 433-455 (2015). (Preliminary version)
• Bouyssou, D., Marchant, T. "An axiomatic approach to bibliometric rankings and indices" Journal of Informetrics, 8, 449-477 (2014). (Preliminary version)
• Bouyssou, D., Marchant, T. ''Multiattribute preference models with reference points" European Journal of Operational Research, 229, 470-481 (2013). The proofs of the results are available online on ScienceDirect as supplementary material. (Preliminary version with proofs included)
• Gravel, N., Marchant, T. and Sen, A. ''Uniform Expected Utility Criteria for Decision Making under Ignorance or Objective Ambiguity" Journal of Mathematical Psychology, 56, 297-315 (2012). (Preliminary version)
• Dimitrov, D., Marchant, T. and Mishra, D. "Separability and Aggregation of Equivalence Relations", Economic Theory, 51, 191-212 (2012). (Preliminary version)
• Bouyssou, D. and Marchant, T. "Subjective expected utility without preferences", Journal of Mathematical Psychology, 55, 457-468 (2011). (Preliminary version)
• Bouyssou, D. and Marchant, T. "Ranking scientists and departments in a consistent manner", International Journal of the American Society for Information Science and Technology, 62, 1761-1769 (2011). (Preliminary version)
• Bouyssou, D. and Marchant, T. "Bibliometric rankings of journals based on Impact Factors: An axiomatic approach" , Journal of Informetrics, 5, 75-86 (2011). (Preliminary version)
• Bouyssou, D. and Marchant, T. "Biorders with frontier" , Order, 28, 53-87 (2011). (Preliminary version)
• Bouyssou, D. and Marchant, T. "Consistent bibliometric rankings of authors and of journals" , Journal of Informetrics, 4, 365-378 (2010). (Preliminary version)
• Bouyssou, D. and Marchant, T. "Additive conjoint measurement with ordered categories", European Journal of Operational Research, 203, 195-204 (2010). The proofs of the results are available online on ScienceDirect as supplementary material. (Preliminary version with proofs included)
• Marchant, T. "Score-based bibliometric rankings of authors", International Journal of the American Society for Information Science and Technology, 60, 1132-1137 (2009). (Preliminary version)
• Marchant, T. "An axiomatic characterization of the ranking based on the h-index and some other bibliometric rankings of authors", Scientometrics, 80, 325-342 (2009). (Preliminary version)
• Bouyssou, D. and Marchant, T. "Ordered categories and additive conjoint measurement on connected sets", Journal of Mathematical Psychology, 53, 92-105 (2009). (Preliminary version)
• Marchant, T., "Scale Invariance and similar Invariance Conditions for Bankruptcy Problems", Social Choice and Welfare, 31, 693-707 (2008). Some errors in this version were pointed out to me by William Thomson (erratum). In this somewhat different version, the errors have been corrected.
• Marchant, T., "A measurement-theoretic axiomatization of trapezoidal membership functions", IEEE Transactions on Fuzzy Systems, 15, 238-242 (2007). (Preliminary version)
• Desimpelaere, C. and Marchant, T., "An empirical test of some measurement-theoretic axioms for fuzzy sets", Fuzzy Sets and Systems, 158, 1348-1359 (2007). (Preliminary version)
• Marchant, T., "An axiomatic characterization of different majority concepts", European Journal of Operational Research, 179, 160-173 (2007). (Preliminary version)
• Bouyssou, D. and Marchant, T., "An axiomatic approach to noncompensatory sorting methods in MCDM, I: The case of two categories", European Journal of Operational Research, 178, 217-245 (2007). (Preliminary version)
• Bouyssou, D. and Marchant, T., "An axiomatic approach to noncompensatory sorting methods in MCDM, II: More than two categories", European Journal of Operational Research, 178, 246-276 (2007). (Preliminary version)
• Marchant, T., "Maximal orness weights with a fixed variability for owa operators", International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems, 14, pp. 271-276 (2006). (Preliminary version)
• Marchant, T., "The measurement of membership by subjective ratio estimation", Fuzzy Sets and Systems, 148, pp. 179-199 (2004). (Preliminary version)
• Marchant, T., "The measurement of membership by comparisons", Fuzzy Sets and Systems, 148, pp. 157-177 (2004). (Preliminary version)
• Marchant, T. and Luce, R.D., "Technical note on the joint receipt of quantities of a single good", Journal of Mathematical Psychology, 47, pp. 66-74 (2003). (Preliminary version)
• Marchant, T., "Towards a theory of MCDM; Stepping away from social choice theory", Mathematical Social Sciences, 45, pp. 343-363 (2003). (Preliminary version)
• Marchant, T., "Cooperative phenomena in crystals and the probability of tied Borda count elections", Discrete Applied Mathematics, 119, pp. 265-271 (2002). (Preliminary version)
• Marchant, T., "The probability of ties with scoring methods: some results", Social Choice and Welfare, 18, pp. 709-735 (2001). (Preliminary version)
• Marchant, T., "The Borda rule and Pareto stability: a further comment", Fuzzy sets and systems, 120/3, pp. 423-428 (2001).
• Marchant, T., "Group Decision Support Systems: a short review", INFOR, 38/1, pp. 1-13 (2000).
• Marchant, T., "Does the Borda rule provide more than a ranking?", Social Choice and Welfare, 17/3, pp. 381-391 (2000).
• Marchant, T. and Pirlot, M., "Modern decisive wives don't wear corsets", Journal of Multi-citeria Decision Analysis, 8-104, pp. 237-238 (1999).
• Marchant, T., "Cognitive maps and fuzzy implication", European Journal of Operational Research, 114, pp. 626-637 (1999).
• Marchant, T., "Cardinality and the Borda score", European Journal of Operational Research, 108, pp. 464-472 (1998). (Preliminary version)
• Marchant, T., "Les systèmes d'aide à la décision en groupe", Nouvelles de la Science et des Technologies , 15, pp. 73-80 (1997).
• Marchant, T., "PROMETHEE and GAIA in a multi-decision maker setting", Ricerca Operativa, 26-79, pp. 19-43 (1997).
• Marchant, T., "Valued relations aggregation with the Borda method", Journal of multi-criteria decision analysis, 5, pp. 127-132 (1996). (Preliminary version)

Chapters in books :

• Gravel, N., Marchant, T., Sen, A. Comparing Societies with Different Numbers of Individuals on the Basis of Their Average Advantage, in Fleurbaey, M., Salles, M. and Weymark, J. A., Eds, Social Ethics and Normative Economics. Springer, 357 pp. (2011). (Preliminary version)
• Bouyssou, D., Marchant, T., Perny, P. Social Choice Theory and Multicriteria Decision Aiding, in Bouyssou, D., Dubois, D., Pirlot, M. and Prade, H., Eds, Concepts and Methods of the Decision-making Process. ISTE & Wiley, 912 pp. (2009). (Preliminary version)
• Bouyssou, D., Marchant, T., Pirlot, M. A conjoint measurement approach to the discrete Sugeno integral, in Brams, S., Gehrlein, W. V. and Roberts, F. S., Eds, The mathematics of preference, choice and order. Essays in honor of Peter C. Fishburn. Springer (2009).
• Bouyssou, D., Marchant, T., Perny, P. Théorie du choix social et aide multicritère à la décision, in Bouyssou, D., Dubois, D., Pirlot, M. and Prade, H., Eds, Concepts et méthodes pour l'aide à la décision, 3 : Analyse multicritère. Hermès, 324 pp. (2006).

Working papers, reports, preprints :

• Bouyssou, D., Marchant, T., and Pirlot, M. " ELECTRE TRI-nB, pseudo-disjunctive: axiomatic and combinatorial results", arXiv:2410.18443 (2024).
• Bouyssou, D., Marchant, T., and Pirlot, M. " About maximal antichains in a product of two chains:A catch-all note", arXiv:2410.16243 (2024).
• Marchant, T., Bouyssou, D., Perny, P., Pirlot, M., Tsoukias, A. and Vincke, Ph. " Les indicateurs en perspective", Preprints of the Service de mathématiques de la gestion, 2003-09 (2003).
• Marchant, T. " Rationing : dynamic considerations, equivalent sacrifice and links between the two approaches", Working Papers of Faculty of Economics and Business Administration, Ghent University, 04/244 (2004).
• Marchant, T. and Bouyssou, D. " A common framework for describing most aggregation procedures in decision aiding", Preprints of the Service de mathématiques de la gestion, 99-23 (1999).

Editorial activities :

• Member of the editorial board of Social Choice and Welfare.
• Member of the editorial board of Quantitative Science Studies.
• Member of the editorial board of Fuzzy Sets and Systems.
• Senior Editor of 4OR, a Quarterly Journal of Operations Research.