5 research outputs found
Incomplete pairwise comparison matrices and weighting methods
A special class of preferences, given by a directed acyclic graph, is
considered. They are represented by incomplete pairwise comparison matrices as
only partial information is available: for some pairs no comparison is given in
the graph. A weighting method satisfies the linear order preservation property
if it always results in a ranking such that an alternative directly preferred
to another does not have a lower rank. We study whether two procedures, the
Eigenvector Method and the Logarithmic Least Squares Method meet this axiom.
Both weighting methods break linear order preservation, moreover, the ranking
according to the Eigenvector Method depends on the incomplete pairwise
comparison representation chosen
Egy életminőség-rangsor a hazautalások alapján
A hazautalások a vendĂ©gmunkások Ă©s az Ĺ‘ket kĂĽldĹ‘ országok közötti kapcsolat egyik fontos mĂ©rĹ‘számát jelentik. Ez egyben számszerűsĂtett mutatĂłja lehet annak is, hogy a saját hazájukhoz kĂ©pest mely országokat rĂ©szesĂtik elĹ‘nyben az emberek, Ăgy egy Ă©letminĹ‘sĂ©g jellegű rangsort állĂthatunk fel azok között. Az elemzĂ©shez a Világbank adatait használtuk 2010-tĹ‘l 2015-ig, az adatbázis a nemzetközi munkabĂ©r, illetve a szemĂ©lyek közötti bilaterális utalásokat tartalmazza. A javasolt mĂ©rĹ‘szám fĂĽggetlen az országok mĂ©retĂ©tĹ‘l, Ă©s figyelembe veszi a teljes hálĂłzat felĂ©pĂtĂ©sĂ©t, azt feltĂ©telezve, hogy minden egysĂ©gnyi átutalás felfoghatĂł egy preferenciakĂ©nt a kĂ©t Ă©rintett ország között
A new parsimonious AHP methodology: assigning priorities to many objects by comparing pairwise few reference objects
We propose a development of the Analytic Hierarchy Process (AHP) permitting to use the methodology also for decision problems with a very large number of alternatives and several criteria. While the ap- plication of the original AHP method involves many pairwise comparisons between considered objects, that can be alternatives with respect to considered criteria or criteria between them, our parsimonious proposal is composed of five steps: (i) direct evaluation of the objects at hand; (ii) selection of some reference objects; (iii) application of the original AHP method to the reference objects; (iv) check of the consistency of the pairwise comparisons of AHP and the compatibility between the rating and the prior- itization with a subsequent discussion with the decision maker who can modify the rating or pairwise comparisons of reference objects; (v) revision of the direct evaluation on the basis of the prioritization supplied by AHP on reference objects. Our approach permits to avoid the distortion of comparing more relevant objects (reference points) with less relevant objects. Moreover, our AHP approach avoids rank reversal problems, that is, changes of the order in the prioritizations due to adding or removing one or more objects from the set of considered objects. The new proposal has been tested and experimentally validated