Tracing back from Charnes et al. [9] many approaches have been proposed to extend the DEA production model to non-convex technologies. The FDH method were introduced by Deprins et al. [13] and it only assumes a free disposal assumption of the technology. This paper, continues further an earlier...

This paper proposes a pragmatic, discrete time indicator to gauge the performance of portfolios over time. Integrating the shortage function (Luenberger, 1995) into a Luenberger portfolio productivity indicator (Chambers, 2002), this study estimates the changes in the relative positions of...

This paper analyses technical efficiency in Angolan banks from 2005 to 2010 with an innovative production frontier model, the <math xmlns="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" altimg="urn:x-wiley:00382280:media:saje12034:saje12034-math-5002" display="inline" overflow="scroll" wiley:location="equation/saje12034-math-5002.png"> <mrow> <mi mathvariant="double-struck">B</mi> <mtext>-convexity</mtext> </mrow> </math> model. The intermediate approach is adopted. It is observed that the efficiency increases over the observation period, according to the international...

This paper applies an innovative DEA (Data Envelopment Analysis) model, the Inverse -convex model, in order to investigate the technical efficiency of a representative sample of Chinese banks. The banks are ranked according to their efficiency over the period 1998-2008. The results paint a mixed...

This paper applies the B-convex model in order to investigate the technical efficiency of a representative sample of US airlines over the period 1998–2010. The results are mixed and reveal that US airlines’ efficiency can be influenced by the size of the airline, mergers and acquisitions,...

This paper analyses technical efficiency in French airports from 2005 to 2008 with the inverse B-convex model. This methodology is adopted permitting to relax the traditional convexity hypothesis common in DEA (data envelopment analysis) literature. The policy implications of the study is that...