In case we have a negative output variable, and the objective is to minimize it. how we can transform that so as to make it positive. Then, as we are maximizing the transformed variable we are in fact minimizing the original output variable.... W. R. T DEA
Please see the following literature and take into the account issues about the translation invariance property that your model should satisfy.
Chapter Variables With Negative Values In Dea
Article Units Invariant and Translation Invariant DEA Models
Article A DEA model for units with negative data
Article Negative data in DEA: A directional distance approach applie...
I would recommend also this paper, the auther has reversed the output fraction during DEA application.
Article Public Sector Hospital Efficiency for Provincial Markets in Turkey
E. Atta Mills
hy, sorry but where do I find the SORM model in MaxDEA, perhaps in the paid one because in the free one I don't seem to see it
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