Theorems on Optimal Value of DEA Model (C\ 2GS\ 2) and Its Application in Simplification on Forecasting Method
有关DEA模型$(C^2GS^2)$的最优值的定理及其在预测方法简化中的应用

Forecast with weak DEA efficiency was made in reference \ by choosing initial point in the production possibility set. But it is difficult sometimes to choose the initial point in the production possibility set, so this paper is trying to omit it after presenting some theorems on optimal value of DEA model (C\ 2GS\ 2). For any given initial point with positive inputs and positive outputs. we don't have to check up if it is in the production possibility set, the forecast with weak DEA efficiency is made as long as the optimal value of the DEA model exists and is positive.