An Approach to Judge Homogeneity of Decision Making Units
نویسندگان
چکیده
It is a general precondition of Data Envelopment Analysis (DEA) that all Decision Making Units (DMUs) to be evaluated are homogeneous. However, it is hard to find a method in the literature to judge whether DMUs are homogeneous or not. This paper firstly analyzes the impacts of DMUs’ non-homogeneity caused by technology difference on the efficiency estimates. It is showed that the DMU under evaluated should be compared to only those DMUs utilizing similar technologies. Then a hypothesis test-based method is proposed to judge DMUs’ homogeneity in technology. Under the assumption that observed input/output data of DMUs are generated from Cobb-Douglas production functions, we illustrate and verify our approach through simulations.
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