Determine the Efficiency of Time Depended Units By Using Data Envelopment Analysis

In the last years, several techniques have been reported for managing a system and recognition of the related decision making units. one of them is based on mathematical modeling. efficiency of any system is very important for all decision makings. often applied data have time dependent inputs/ outputs. to calculate the efficiency of time dependent data, a new calculation method has been developed and reported here. by this method, the efficiency has been calculated, with minimum errors and minimum mathematical solving model. the data are often time dependent, therefore spline function has been estimated as a function of time, without using any particular time. based on this developed function, the efficiency of time dependent data of a numerical example has been calculated and reported.