ordinary CE model, the input prices are assumed to be definite. In recent years, various attempts have been
made to measuring CE when the input prices are as trapezoidal fuzzy numbers. The main contribution of this
paper is to provide a new approach for generalizing the CE of decision making units in data envelopment
analysis when the input prices are trapezoidal fuzzy numbers, where concepts of fuzzy linear programming
problems and CE, are directly used. Here, the author used the linear ranking functions to compare fuzzy
numbers. The proposed method is illustrated with two application examples and proves to be persuasive and
acceptable in real world systems.
