There is consensus in the literature about the need to control for socioeconomic status and other contextual variables at student and school level in the estimation of value added models, for which methodologies rely on hierarchical linear models. However, this approach is problematic because...

A vast amount of literature is devoted to analyzing the effects of deregulating and restructuring measures in the European railway sector and the results are not totally unambiguous. The contribution of this paper to the existing literature is twofold. Firstly, we estimate efficiency levels...