Handling effects of reinforced preference and counter-veto in credibility of outranking

Bernard Roy (1) , Roman Slowinski (2)

1 LAMSADE - Laboratoire d'analyse et modélisation de systèmes pour l'aide à la décision
2 Institut d'Informatique

The aim of this paper is to generalize the way of computing the credibility of outranking in a multiple criteria aggregation procedure, in view of taking into account two new ef-fects called reinforced preference and counter-veto. These effects concern only those cri-teria for which, as soon as action a is “judged very strongly preferred” to action b, one wishes that the credibility of outranking of a over b is greater than that for the case where (all things equal elsewhere) the preference is not “judged very strong”. To achieve this goal, we propose two complementary ways. The first one involves a reinforced pref-erence threshold which affects the concordance degree, and the second one involves a counter-veto threshold which affects the insertion of discordance degree in the calcula-tion of the credibility of outranking. The introduction of these two new effects remains compatible with the handling of purely ordinal preference scales. The resulting new in-dex of the credibility of outranking can be used, in particular, in ELECTRE method

Mots clés: Dis-cordance; Decision support; Multiple criteria analysis; Outranking; Concordance; Dis-cordance.

Domaines: Complexité [cs.CC]

Bernard Roy, Roman Slowinski. Handling effects of reinforced preference and counter-veto in credibility of outranking. 2007. ⟨hal-00174503⟩