Importing Fuzzy Measure to Relative Scores of Technical Efficiency

Abstract

This paper suggests extending scores of technical efficiency as used in, for example, Data Envelopment Analysis (DEA) to efficiency scores defined as so-called fuzzy intervals. Fuzzy scores allow the decision maker to use scores of technical efficiency in combination with other sources of available performance information e.g. expert opinions, key figures etc. In this sense, results of, DEA will be used to control the \'subjective\' information supplied by expert opinions while the subjective information will be used to supplement the narrow Input-output modeling of the production units used in DEA. So, fuzzy measures become formal images of the evaluation otherwise done implicitly by the decision maker.