Efficiency Analysis of China＇s Commercial Banks Based on DEA： Negative Output Investigation

This paper focuses on the shortcomings of the extensively-used method of DEA in evaluating the efficiency of bank, i.e., the DEA method cannot make further comparisons to the efficient units and it does not take into account the situation of negative input or output value. We use the BCC model in DEA to measure the fourteen Chinese commercial banks＇ efficiency in 1999. Since BCC model has the property of transformation invariance, the problem of negative input or output value is thus resolved. We also use the super-efficiency DEA model to rank all the efficient units completely.