This paper proposes an efficiency analysis of the major European incumbent firms in the fixed telecommunications sector …. The non-parametric approach, that has been adopted here, expresses the efficiency according to a directional distance … measure, allowing to consider the different nature of outputs categories, according to their technological content. Efficiency …

The problem of infeasibility arises in conventional radial super-efficiency data envelopment analysis (DEA) models … under variable returns to scale (VRS). To tackle this issue, a Nerlove–Luenberger (N–L) measure of super-efficiency is … developed based on a directional distance function. Although this N–L super-efficiency model does not suffer infeasibility …

This article studies the role of social capital on cotton production efficiency and productivity for a sample of small … contribution to production efficiency after land. The Luenberger indicator is used to assess the productivity improvement …