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dc.contributor.authorKrivonozhko, Vladimiren_US
dc.contributor.authorFørsund, Finn R.en_US
dc.contributor.authorLychev, Andrey V.en_US
dc.description.abstractA new DEA model has been introduced recently combining the primal and the dual models in order to impose strong complementary slackness conditions. It was claimed that a reference set that contains the maximum number of efficient units can then be determined. The model is very interesting as a theoretical idea. However, not only does the computational burden increase significantly, but it seems also that the basic matrices may be inherently ill-conditioned, leading to wrong results. Numerical experiments have been carried out on two real datasets of medium size with 163 and 920 units. These experiments show pervasive existence of ill-conditioned matrices leading to obviously wrong estimates of efficiency scores, and units declared as efficient reference units while actually being inefficient.en_US
dc.publisher|aDep. of Economics, Univ. of Oslo |cOsloen_US
dc.relation.ispartofseries|aMemorandum // Department of Economics, University of Oslo |x2010,17en_US
dc.subject.keywordData envelopment analysisen_US
dc.subject.keywordBCC modelen_US
dc.subject.keywordDEA/SCSC modelen_US
dc.subject.keywordstrong complementary slackness conditionsen_US
dc.titleA note on imposing strong complementary in DEAen_US
dc.typeWorking Paperen_US

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