EVALUATION DECISION UNITS IN THE PRESENCE OF ORDINAL AND NON-DISCRETIONARY DATA

In original data envelopment analysis (DEA) models ,input and output are measured by exact values on a ratio scale. However , this assumption may not be always valid .for exampel some outputs and inputs may be only known as in forms of imprecise and non –discretionary data . in this paper we try to suggest a generalized model when some inputs and outputs are ordinal and non-discretionary data .

Keywords:

Data envelopment analysis , ordinal data , non-discretionary data