Our paper focuses on a robustness analysis of efficiency scores in the context Data Envelopment Analysis (DEA) assuming interval scale data, as defined A. Dehnokhalaji, P. J. Korhonen, M. Köksalan, N. Nasrabadi and Wallenius, “Efficiency to incorporate data”, European Journal Operational Research 207 (2), 2010, pp. 1116–1121. We first show that definition score used our is well-defined measure ...