Technical efficiency of wheat farms in eastern England is measured through the estimation of a stochastic frontier production function using panel data for the 1993-1997 crop years. Variations in the technical efficiency index across production units are explained through a number of managerial...

A preventive HIV vaccine offers the best hope for ending the AIDS pandemic. Scientific evidence suggests that an HIV vaccine is possible, and funding for HIV vaccine research and development (R&D) has increased substantially in recent years. The speed of progress toward an HIV vaccine will...

Citations are increasingly used for research evaluations. It is therefore important to identify factors affecting citation scores that are unrelated to scholarly quality or usefulness so that these can be taken into account. Regression is the most powerful statistical technique to identify these...

The citations to a set of academic articles are typically unevenly shared, with many articles attracting few citations and few attracting many. It is important to know more precisely how citations are distributed in order to help statistical analyses of citations, especially for sets of articles...

The Vuong test for non-nested models is being widely used as a test of zero-inflation. We show that such use is erroneous. We see that this stems from a misunderstanding of what is meant by the term “non-nested model” and suggest other approaches for determining zero-inflation

Purpose To assess whether interdisciplinary research evaluation scores vary between fields. Design/methodology/approach The authors investigate whether published refereed journal articles were scored differently by expert assessors (two per output, agreeing a score and norm referencing) from...

Purpose Scholars often aim to conduct high quality research and their success is judged primarily by peer reviewers. Research quality is difficult for either group to identify, however and misunderstandings can reduce the efficiency of the scientific enterprise. In response, we use a novel term...