In this paper, we introduce the Covent Ordinary Least Square (COLS) mathod, indicate its use in establishing the Frontier Production Function. The method is applied to analyse 27 iron and steel firms.

• 本文简单介绍了修正最小二乘估计（COLS）在建立前沿生产函数中的应用，并对27家重点钢铁企业进行了实证分析。