The frontier production function, a parametric function of any form, can be estimated by sample data . this study shows that the projected panel data, which is the inputs and relative exponential maximum output data set, obtained by conducting the data envelopment analysis with the log inputs and output, is approximately piecewise cobb-douglas under a certain assumption 根據(jù)前沿生產(chǎn)函數(shù)的定義,本文利用投入產(chǎn)出的對數(shù)形式和數(shù)據(jù)包絡分析方法求出了相對指數(shù)最大產(chǎn)出,并證明了在一定的條件之下,這種數(shù)據(jù)結構即所謂的支撐面板數(shù)據(jù)具有分段近似cobb-douglas性。