Scale and cost efficiency analysis of networks of processes
Scale and cost efficiency analysis of networks of processes
复制标题
DOI：
10.1016/j.eswa.2010.11.077
复制
发表时间：
2011-06
期刊：
影响因子：
--
通讯作者：
S. Lozano
中科院分区：
文献类型：
--
作者：
S. Lozano
本文提出了一种计算同质过程网络的技术、规模、成本和分配效率分数的简单方法。系统的生产可能性集（PPS）是通过单个过程的PPS的组合而形成的，而这些过程又以传统的、公理化的方式使用观察到的数据进行建模。首先，利用关系网络DEA方法计算了系统总体规模和技术效率。本地规模收益（RTS）也可以用这些模型来估计。其次，在外生投入价格已知的前提下，求解最小成本网络DEA模型，推导出成本和配置效率。本文用文献中的一个两阶段问题来说明所提出的方法，从技术和规模效率、RTS以及成本和分配效率两方面显示了更详细的问题评估的有用性。
In this paper a simple way of computing technical, scale, cost and allocative efficiency scores for homogeneous networks of processes is presented. The system Production Possibility Set (PPS) is formed through the composition of the PPS of the individual processes, which, in turn, are modelled in the conventional, axiomatic way using observed data. Firstly, the overall system scale and technical efficiency are computed using the relational network DEA approach. Local Returns To Scale (RTS) can also be estimated with these models. Secondly, assuming the prices of exogenous inputs are known, a minimum cost network DEA model is solved, from which cost and allocative efficiencies are derived. The proposed approach is illustrated with a two-stage problem from the literature, showing the usefulness of a more detailed problem assessment both in terms of technical and scale efficiency and RTS and in terms of cost and allocative efficiency.