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The data envelopment analysis models (DEA) are provided to measure set of relative efficiency from decision making unit with different inputs to make different outputs. For a discussion of inaccurate data, the fuzzy concept is introduced .it is main objective of this paper to provide a new method for evaluating the efficiency in method of network data envelopment analysis that using inaccurate data fuzzy. The proposed methods to calculate the efficiency has been done in tow-stage yet, however in this study the three-stage are used to evaluate the efficiency.

Providing a new three stage data envelopment analysis model (DEA) in fuzzy environment