Production Frontiers and Panel Data: An Application to U.S. Class 1 Railroads
比较了从生产函数直接估算无效率的几种方法，包括成本函数法、克莱因法和迭代SUR技术，并检验了不同方法给出的效率排名。
In this article, the appropriateness of inefficiency measures obtained directly from the production function as in Schmidt and Sickles (1984) is examined relative to those provided by (a) the cost function aproach, (b) Klein's approach, and (c) the iterative SUR technique. Efficiency rankings yielded by different methods are also compared and tested.