基于两阶段非期望DEA模型的商业银行效率评估

本文将两阶段非期望DEA模型引入银行效率评估,从银行系统内部运营结构入手,构建符合银行结构特征的两阶段网络DEA非线性模型.基于合作共赢的思想,该模型使中间产出在两个子系统的权重相等,将关系模型从规模报酬不变扩展到规模报酬可变的情形,每个银行的系统效率分解为两个子系统的乘积,启发式搜索方法被用来求解新提出的模型.本文将银行经营过程分为筹资阶段和运营阶段,分别应用加权和两阶段模型与该模型对23家商业银行的效率进行测算,验证了提出新模型的合理性.

Efficiency evaluation of commercial banks based on two-stage DEA model with undesirable output

Considering the non-performing loan,this paper introduces the undesirable output into the bank efficiency assessment and constructs a two-stage network DEA model that conforms to the characteristics of the bank structure.This study assumes variable returns to scale,because the input and output of commercial bank vary greatly.However,there is the product of unknown variables in the extended VRS relational model,that is,the objective function is nonlinear.In order to convert it into a linear model,this paper applies a heuristic search to calculating the optimal solution for the new model.Based on the win-win cooperation,the intermediate output is equal in weight of the two subsystems,the system efficiency of each bank is a product of two subsystems.Thus,the extended relational model.Based on the business characteristics of the bank,the bank operation process is divided into the phase of money-raising and the operation.The new model and additive weighting of two-stage model are used to measure the efficiency of the 23 commercial banks,and the rationality of the proposed model is verified.As the national economy and policies,we evaluated efficiency analysis for 4 years based on the intertemporal data,and observe the trends of three different banks.The result of an empirical study reveals that the our proposed model can better reflect the current development trend of the banking industry,the average annual efficiency of state-owned bank is higher than that of joint-stock commercial banks,which is higher than that of urban commercial banks.In terms of the stability of efficiency fluctuations,joint-stock commercial banks are better than urban banks,and urban banks are superior to state-owned banks.Due to differences in management levels and strategy,the efficiency levels of different banks of the same nature are also uneven,and finally considering the current policy we make an analysis and give the corresponding strategies.