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circumstances are not always the same. The Impact Factor (IF) was developed by ISI (which is now named Thomson Reuter) and has been posted in the Journal Citation Reports (JCR) since 1975. The IF is used globally as a unique and sole journal indicator

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Abstract  

Competition is one of the most essential features of science. A new journal indicator - the"number of Matthew citations in a journal" was found that reflects certain aspects of thiscompetition. The indicator mirrors the competition of countries in scientific journals forrecognition in terms of seemingly "redistributed" citations.The indicator shows, as do other journal indicators, an extreme skewed distribution over anensemble of 2712 SCI journals. Half of all Matthew citations are contained in 144 so-calledMatthew core journals.In this paper, a new typology of scientific journals, including the Matthew core journals, isintroduced. For a few selected journals, graphs are presented showing national impact factors aswell as the absolute number of Matthew citations gained or lost by the countries publishing in thejournal.Scientific competition among countries for recognition is strongest in the Matthew corejournals, they are the most competitive markets for scientific publications. Conclusions are drawnfor national science policy, for the journal acquisition policy of national libraries, and for thepublication behaviour of individual scientists.

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]. 19 Universiteit Leiden CWTS (c2017). SNIP – Journal Indicator. Available from: http://journalindicators.com/Content/CWTS%20Journal%20Indicators%20June%202017.xlsx [accessed

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journals. J. Informetr., 2010, 4 (3), 265–277. 17 CWTS Journal Indicators. http://www.journalindicators.com/ 18 REF 2014. http

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Introduction Current scientometric research focuses on several aspects of research, science, scholarly communication and innovation, and often applies complex, composite indicators such as citation-based journal indicators (e

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integral part of ERA in 2010, but were omitted from the 2012 ERA (Atkinson and McLoughlin 2011 ; Runeson 2011 ) and replaced with a ‘journal indicator list’. While this list overcomes some concerns associated with the journal ranking (Vanclay 2011

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, the corresponding JCS is calculated only with the reviews in the journal. Thus, the important differences of our journal indicator JCS with the ISI journal impact factor are: – JCS values are calculated with the same citation window as used for

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-based journal indicators adding to the bibliometric toolbox? . Journal of the American Society for Information Science and Technology 60 7 1327 – 1336 10.1002/asi.21024 . McPherson , M , Smith-Lovin , L

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2009 How are new citation-based journal indicators adding to the bibliometric toolbox? . Journal of the American Society for Information Science & Technology 60 7 1327 – 1336 10.1002/asi.21024

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Scientometrics
Authors: J. A. García, Rosa Rodriguez-Sánchez, J. Fdez-Valdivia, and J. Martinez-Baena

cluster allocation, the centre of each cluster (in terms of indicator values) is calculated as the weighted mean of the journal indicator values, also known as the centroid. Reallocation of the centroids proceeds by iteration until a stable solution is

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