Additive Model
In basic models of DEA, we distinguish between input-oriented and output-oriented models. in this model, we combine both orientations in a single model, called Additive model.
![add[1].JPG](/uploadimages/add[1].JPG)
Charnes, A., Cooper, W.W., Golany, B., and Seiford, L., 1985, " Foundations of Data Envelopment analysis for Pareto-Koopmans efficient empirical production functions," Jtwrnal of Econometrics, 30, 91-107. 