Authors from Stanford University, SciTech Strategies and Elsevier publish the largest ever citation-based ranking.
Of all Hungary's higher education institutions, the Budapest University of Technology and Economics has the highest number of researchers included in the database of the 100 000 most-cited authors. The international list published in the latest edition of Magyar Tudomány shows that the 150 – Hungary-based – scholars include 62 researchers from the Hungarian Academy of Sciences (MTA), 18 researchers from the Budapest University of Technology and Economics, 17 researchers each from the Eötvös Loránd University and the Semmelweis University each, 16 researchers from the University of Szeged, 9 researchers from the University of Pécs, 7 researchers from the University of Debrecen, 1 researcher from the University of Miskolc, 1 researcher from the University of Pannonia, 1 researcher from the Szent István University and 1 researcher from the National Institute of Oncology.
The number of researchers from selected countries on the list:
Czech Republic: 153
New Zealand: 387
A selection of prestigious foreign universities on the list:
Harvard University: 2,011
Stanford University: 996
MIT: 518 ETH
University of Vienna: 210
The data was collected from the Scopus database. In reality, the open access supplementary tables of the article contain three somewhat different rankings. The first ranking is based on the citations of articles published after 1960 over 22 years (from January 1, 1996 until December 31, 2017) and the related metrics. The composite indicator considers six citation metrics: total citations, the Hirsch index, the coauthorship-adjusted Schreiber index, number of citations to papers as single author, number of citations to papers as single or first author and number of citations to papers as single, first, or last author. The article classifies scientists into 22 scientific fields and 176 subfields. Metrics with and without self-citations are given for each category.
The authors stress that citation metrics may be distorted by self-citations and so-called citation farms, clusters of authors massively citing each other's papers. They also found it relevant to provide data on the ratio of citations divided by the number of citing papers. Extremely high ratios may point to the involvement of citation farms.
The second ranking is different from the first in that that it is calculated using data for citations in a single year (1997). And the difference between the third and the first is that it is also includes citations received in 2018.
The authors found 6 880 389 researchers who published at least five articles based on the database. The tables show the 25th, 50th, 90th, 95th and 99th percentile relevant to each scientific field. The institutional affiliation and the respective country of the researchers on the 100 000-strong list are inferred based on 2017.
Júlia Gimes/Magyar Tudomány 181 (2020) 2 Kitekintés