This paper has two main aims: (i) to criticize the diagnosis about the research performance of the EU contained in the so-called “European Paradox”, according to which Europe plays a leading world role in terms of scientific excellence, but lacks the entrepreneurial capacity of the U.S. to...

Waltman & Van Eck, in press, contains a systematic large-scale empirical comparison of classification-system-based versus source normalization procedures. A source-normalization procedure SNCS performs better than a normalization procedure based on the system where publications are classified...

We study the problem of normalizing citation impact indicators for differences in citation practices across scientific fields. Normalization of citation impact indicators is usually done based on a field classification system. In practice, the Web of Science journal subject categories are often...

In this paper, we develop a new methodology for comparing normalization procedures based on different classification systems. Firstly, a pair of normalization procedures should be compared using their own classification systems for evaluation purposes. Secondly, when the two procedures are...

This paper studies the role of extremely highly cited articles in two instances: the measurement of citation inequality, and mean citation rates. Using a dataset, acquired from Thomson Scientific, consisting of 4.4 million articles published in 1998-2003 in 22 broad fields with a five-year...

This paper studies the evolution of research productivity of a sample of economists working in the best 81 departments in the world in 2007. The main novelty is that, in so far as a productivity distribution can be identified with an income distribution, we measure productivity mobility in a...

This paper has two aims: (i) to introduce a novel method for measuring which part of overall citation inequality can be attributed to differences in citation practices across scientific fields, and (ii) to implement an empirical strategy for making meaningful comparisons between the number of...

The use of citation numbers for the assessment of research quality has become highly relevant in modern science. Although it is well known that scientific domains strongly differ in terms of citation rates, bibliometric indicators currently used in research assessment are often based on the sole...

Recent results indicate that, in spite of the skewness of citation distributions, the ranking of research units that focus on the upper tail of citation distributions is quite similar to the ranking one obtains with average-based indicators. This paper explores the conjecture that this can be...

This paper studies the assignment of responsibility to the participants in the case of co-authored scientific publications. In the conceptual part, we establish that the key shortcoming of the full counting method is its incompatibility with the use of additively decomposable citation impact...