Abstract
In the efficiency analysis of decision making units, a unit may demonstrate both positive and negative inputs and outputs data. It is also possible that some undesirable inputs have to be used to produce the desirable outputs and along with them some undesirable outputs also get produced. Moreover, the conventional data envelopment analysis models are single period. This paper presents the non-radial measure of efficiency by establishing a multi-period additive DEA model taking into consideration both desirable and undesirable inputs-outputs with positive and non-positive values. The proposed efficiency model has all the requisite features of strong disposability, translation invariance, and unit independence. The paper also develop a multi-period additive super-efficiency model to discriminate the performance of efficient decision making units.
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