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Available online at www.ijo.ir Iranian Journal of Optimization 3(2011) 102- 119. Iranian Journal of. Optimization Dealing with Returns to Scale in Presence of Both Cardinal and Ordinal Data: A DEA Approach Reza Kazemi Matin *
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Availableonlineatwww.ijo.ir IranianJournalofOptimization3(2011)102-119 IranianJournal of Optimization DealingwithReturnstoScaleinPresenceofBoth CardinalandOrdinalData:ADEAApproach RezaKazemiMatin* DepartmentofMathematics,IslamicAzadUniversity,KarajBranch, P.O.Box31485-313Karaj,Iran. Abstract Thispaperdealswiththechangeofreturnstoscale(RTS)statusoffullyefficient unitsundersomeimportantcasesofimprecisedataindataenvelopmentanalysis framework.Inthisevaluationtwoclassificationinvariantmethodsareintroduced withthenormalsizeofconstraintsandvariables.Anempiricalapplicationtoan Iranianuniversitydepartmentsillustratestheapproach. Keywords:Dataenvelopmentanalysis(DEA);Returnstoscale;Imprecisedata; * Correspondingauthor:E-Mail:rkmatin@kiau.ac.ir