A logical interpretation for the eigenvalue method in ahp

Kazuyuki Sekitani, Naokazu Yamaki

Research output: Contribution to journalArticle

17 Citations (Scopus)


The eigenvalue method (EM), that is to find the principal eigenvector of a pairwise comparison matrix, is widely used and known to be practical in Analytic Hierarchy Process (AHP). However, the validity of EM has never been fully proved. In this article, we present an equilibrium model and four optimization models to show the logical justification for using EM in AHP. By introducing two concepts, self-evaluation and non-self-evaluation, into AHP, the fundamental theorem (Frobenius' Theorem) for EM is interpreted as two optimization problems. From these two concepts, a noncooperative game with a pairwise comparison matrix is also formulated and its equilibrium solution is the principal eigenvector. We propose two discrepancy indices between self-evaluation and non-self-evaluation and formulate four discrepancy-minimization problems. An optimal solution for two minimization problems among them is equal to the principal eigenvector.

Original languageEnglish
Pages (from-to)219-232
Number of pages14
JournalJournal of the Operations Research Society of Japan
Issue number2
Publication statusPublished - Jun 1999

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