Efficiency decomposition in two-stage data envelopment analysis: An application to non-life insurance companies in Taiwan
Efficiency decomposition in two-stage data envelopment analysis: An application to non-life insurance companies in Taiwan
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DOI：
10.1016/j.ejor.2006.11.041
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发表时间：
2008-02-16
影响因子：
6.4
通讯作者：
Hwang, Shiuh-Nan
中科院分区：
文献类型：
--
作者：
Kao, Chiang;Hwang, Shiuh-Nan
利用传统的数据包络分析(DEA)方法对可分为两个阶段的决策过程的效率进行了全过程和每个阶段的独立测量，以找出效率低下的原因。本文对传统的DEA模型进行了修正，考虑了整个过程中两个子过程之间的串联关系。在这个框架下，整个过程的效率可以分解为两个子过程效率的乘积。除了这一良好的数学性质，台湾非寿险公司的案例表明，在独立模型中出现的一些不寻常的结果在关系模型中并不存在。换言之，本文建立的关系模型在衡量效率方面更可靠，因此能够更准确地识别效率低下的原因。基于该模型的结构，可以将效率分解的思想推广到多级串联的系统。(C)2007 Elsevier B.V.保留所有权利。
The efficiency of decision processes which can be divided into two stages has been measured for the whole process as well as for each stage independently by using the conventional data envelopment analysis (DEA) methodology in order to identify the causes of inefficiency. This paper modifies the conventional DEA model by taking into account the series relationship of the two sub-processes within the whole process. Under this framework, the efficiency of the whole process can be decomposed into the product of the efficiencies of the two sub-processes. In addition to this sound mathematical property, the case of Taiwanese non-life insurance companies shows that some unusual results which have appeared in the independent model do not exist in the relational model. In other words, the relational model developed in this paper is more reliable in measuring the efficiencies and consequently is capable of identifying the causes of inefficiency more accurately. Based on the structure of the model, the idea of efficiency decomposition can be extended to systems composed of multiple stages connected in series. (c) 2007 Elsevier B.V. All rights reserved.