A Modified Semi-Oriented Radial Measure in Dealing with Negative Data in DEA

Conventional Data Envelopment Analysis (DEA) models assume non-negative inputs and outputs. In many real applications, some inputs and/or outputs can take negative values. Recently, Emrouznejad et al. (2010) introduced a Semi-Oriented Radial Measure (SORM) for modeling DEA with negative data. This paper investigates the SORM model from both axiomatic foundation and efficiency measurement modeling and introduces a revised version of SORM.

Keywords:

DEA , Efficiency measurement , Negative data , Disposability