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On Saaty’s and Koczkodaj’s inconsistencies of pairwise comparison matrices. (English) Zbl 1177.90205
Summary: The aim of the paper is to obtain some theoretical and numerical properties of Saaty’s and Koczkodaj’s inconsistencies of pairwise comparison matrices \((PRM)\). In the case of \(3 \times 3 PRM\), a differentiable one-to-one correspondence is given between Saaty’s inconsistency ratio and Koczkodaj’s inconsistency index based on the elements of \(PRM\). In order to make a comparison of Saaty’s and Koczkodaj’s inconsistencies for \(4 \times 4\) pairwise comparison matrices, the average value of the maximal eigenvalues of randomly generated \(n \times n PRM\) is formulated, the elements \(a ij (i < j)\) of which were randomly chosen from the ratio scale \[ \dfrac{1}{M}, \dfrac{1}{M-1}, \ldots , \dfrac{1}{2}, 1, 2, \ldots , M-1, M, \] with equal probability \(1/(2M - 1)\) and \(a ji\) is defined as \(1/a ij\). By statistical analysis, the empirical distributions of the maximal eigenvalues of the \(PRM\) depending on the dimension number are obtained. As the dimension number increases, the shape of distributions gets similar to that of the normal ones. Finally, the inconsistency of asymmetry is dealt with, showing a different type of inconsistency.

MSC:
90B50 Management decision making, including multiple objectives
15A18 Eigenvalues, singular values, and eigenvectors
Software:
Concluder
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