2010 | OriginalPaper | Chapter
Pairwise Comparison Matrices: Some Issue on Consistency and a New Consistency Index
Authors : Bice Cavallo, Livia D’Apuzzo, Gabriella Marcarelli
Published in: Preferences and Decisions
Publisher: Springer Berlin Heidelberg
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In multicriteria decision making, the pairwise comparisons are an useful starting point for determining a ranking on a set
X
= {
x
1
,
x
2
,...,
x
n
} of alternatives or criteria; the pairwise comparison between
x
i
and
x
j
is quantified in a number
a
ij
expressing how much
x
i
is preferred to
x
j
and the quantitative preference relation is represented by means of the matrix
A
= (
a
ij
). In literature the number
a
ij
can assume different meanings (for instance a ratio or a difference) and so several kind of pairwise comparison matrices are proposed. A condition of consistency for the matrix
A
= (
a
ij
) is also considered; this condition, if satisfied, allows to determine a weighted ranking that perfectly represents the expressed preferences. The shape of the consistency condition depends on the meaning of the number
a
ij
. In order to unify the different approaches and remove some drawbacks, related for example to the fuzzy additive consistency, in a previous paper we have considered pairwise comparison matrices over an abelian linearly ordered group; in this context we have provided, for a pairwise comparison matrix, a general definition of consistency and a measure of closeness to consistency. With reference to the new general unifying context, in this paper we provide some issue on a consistent matrix and a new measure of consistency that is easier to compute; moreover we provide an algorithm to check the consistency of a pairwise comparison matrix and an algorithm to build consistent matrices.