Extended data envelopment analysis model based on C~2GS~2 model-EC~2GS~2
Hao Hai, GU Pei-liang · Journal of systems engineering · 2004
An extended data envelopment analysis model (EC~2GS~2) is derived from C~2GS~2 model by decreasing the constraint conditions of C~2GS~2 model. The concept of strong-efficiency is put forward and the properties referred to EC~2GS~2 model are proved. Comparing with C~2GS~2 model, the model has three advantages in practice and theory: 1. The model estimates the relative efficiency more exactly. 2. More information can be obtained from reference DMUs as we have expected. 3. Suppose that the output (input) of evaluation DMU is invariable, its relative efficiency varies inversely to its input (directly to its output) while the input and output of reference DMUs are fixed.