Comparison the Efficiency of Iranian POST BANKS Using by Nonparametric and Parametric Methods

The main Purpose of this research is comparison of efficiency of independent headquarters of Iranian post bank by using non- parametric (Data Envelopment Analysis) and parametric methods (Stochastic Frontier Functions). In order to estimate and evaluate the efficiency, data on balance sheet have been used for 28 independent headquarters of Iranian Post Bank during 1999-2005. Results show, there is no significant differences between non – parametric and parametric approach in measuring the efficiency of independent headquarters of Iranian post bank.Regarding to results of DEA, means of cost efficiency, technical efficiency and allocative efficiency is 25%, 83% and 32% respectively.Logarithmic - Linear Translog cost function is utilized in parametric method to estimate efficiency and define the determinant factors. The Results showed the efficiency of Iranian Post Bank is 55%. The efficiency of headquarters has inverse relation with the size of Post Bank (total asset), number of Employee, number of branches, and directly relation with time trend and total income of Post Bank. Finally, in this essay, for microeconomic basic and effect of random variables SFA is preferred to DEA.