## Universality of performance indicators based on citation and reference counts

T. S. Evans, N. Hopkins, B. S. Kaube, 2012, Scientometrics, vol. 93, no. 2 Link to the original publication We find evidence for the universality of two relative bibliometric indicators of the quality of individual scientific publications taken from different data sets. One of these is a new index that considers both citation and reference counts. We demonstrate this universality for relatively well cited publications from a single institute, grouped by year of publication and by faculty or by department. We show similar behaviour in publications submitted to the arXiv e-print archive, grouped by year of submission and by sub-archive. We also find that for reasonably well cited papers this distribution is well fitted by a lognormal with a variance of around σ 2 = 1.3 which is consistent with the results of Radicchi et al. (Proc Natl Acad Sci USA 105:17268–17272, 2008). Our work demonstrates that comparisons can be made between publications from different disciplines and publication dates, regardless of their citation count and without expensive access to the whole world-wide citation graph. Further, it shows that averages of the logarithm of such relative bibliometric indices deal with the issue of long tails and avoid the need for statistics based on lengthy ranking...

Read More## Tim Evans’ Research

Tim Evans’ main interest is in the behaviour of many body systems both in and out of equilibrium. Currently he is interested in ideas falling under the broad area of complex systems. In particular the properties of Complex Networks, such as the “six degrees of separation”, intrigue me. This is both from a theoretical perspective and in terms of applications to practical problems such as bibliometrics or cultural transmission, part of an interest in sociophysics in general. For instance Tim has an ongoing project in Archaeology. Tim is also interested in Quantum Field theory in general. His early research was on the many-body problems where the underlying dynamics is described by quantum field theory, a topic known as Thermal Field Theory or Finite Temperature Field Theory. Initially this was in the context of relativistic particle physics which is important for applications such as cosmology and quark gluon plasmas. Later Tim became interested in parallel problems in condensed matter physics, where lab based experiments can be performed. Tim is also interested in general issues with quantum field theory which led to work on multiplicative anomalies and in turn their implications for zeta-function renormalisation in...

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