Finally, scale efficiency turns out to be the ideal concept to control these activity changes, rather than just CCR- or BCC-efficiency. Moreover, it allows for exact calculations of the resulting economic effects, and these effects give new insights beyond classical DEA. Such findings of mutual effects improve a DMU’s ability to reassess upsizing and downsizing of activities. And inversely, how does BCC-efficiency behave when activity scaling under constant CCR-efficiency is applied. In this paper we propose a comparative analysis of both concepts: How does activity scaling under constant BCC-efficiency influence CCR-efficiency. To evaluate a DMU’s efficiency for both models might be helpful, but it does not always capture the essential issues at stake. The right choice of a DEA model-CCR or BCC-often, if not always, is a difficult decision. (Manag Sci 30:1078–1091, 1984) are the most popular approaches of measuring efficiency among a group of decision making units, DMUs, in data envelopment analysis, DEA. (Eur J Oper Res 2:429–444, 1978) together with the BCC model by Banker et al.
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