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Estimating the inefficiency in the Norwegian bus industry from stochastic cost frontier models

机译：从随机成本前沿模型估算挪威公交行业的效率低下

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摘要

A stochastic cost frontier function based on data from 170 of the 175 Norwegian subsidized bus companies is estimated under two alternative presumptions regarding the distri- bution of the inefficency among the bus operators. When the inefficiency is assumed to be half-normally distributed, the average inefficiency in the industry is estimated to be 13.7 per cent. This calculated value is nearly halved (7.2 per cent) when the exponential distribution is applied, while the ranking of the companies according to inefficiency is unchanged. By regressing the estimated inefficiency values for each company on some exogenous variables describing its ownership structure and the subsidy policy which it faces, it is seen that inefficiency of the companies which negotiate with the public authorities over the subsidy amounts is slightly higher than the inefficiency of the companies which face a subsidy policy based on cost norms.
机译：根据来自175家挪威受补贴公交公司中的170家的数据，在两个关于公交运营商效率低下的假设下，估计了一种随机成本前沿函数。如果假设效率低下是正态分布的一半，则该行业的平均效率低下估计为13.7％。应用指数分布时，此计算值几乎减半（7.2％），而根据效率低下的公司排名不变。通过在描述公司所有权结构和所面临的补贴政策的一些外在变量上对每个公司的估计低效率值进行回归，可以看出，与公共当局就补贴金额进行谈判的公司的低效率略高于该公司的低效率。面临基于成本规范的补贴政策的公司。

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