The input/output estimation by inverse DEA model in two-stage structures

Inverse DEA model is a useful tool for estimating inputs/outputs level of decisionmaking units (DMU)s. It can be integrated to estimate inputs/outputs level of a two-stage network.To this end, assume that among a group of comparable two-stage DMUs, we increase outputs levelof a DMU. The question is that how much should be inputs level change in order to the efficiencylevel of all DMUs stay unchanged. This paper discuses the above mentioned question.