-
Larivière, V.; Gingras, Y.; Archambault, E.: ¬The decline in the concentration of citations, 1900-2007 (2009)
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- Abstract
- This article challenges recent research (Evans, 2008) reporting that the concentration of cited scientific literature increases with the online availability of articles and journals. Using Thomson Reuters' Web of Science, the present article analyses changes in the concentration of citations received (2- and 5-year citation windows) by papers published between 1900 and 2005. Three measures of concentration are used: the percentage of papers that received at least one citation (cited papers); the percentage of papers needed to account for 20%, 50%, and 80% of the citations; and the Herfindahl-Hirschman index (HHI). These measures are used for four broad disciplines: natural sciences and engineering, medical fields, social sciences, and the humanities. All these measures converge and show that, contrary to what was reported by Evans, the dispersion of citations is actually increasing.
- Date
- 22. 3.2009 19:22:35
-
Ma, N.; Guan, J.; Zhao, Y.: Bringing PageRank to the citation analysis (2008)
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- Abstract
- The paper attempts to provide an alternative method for measuring the importance of scientific papers based on the Google's PageRank. The method is a meaningful extension of the common integer counting of citations and is then experimented for bringing PageRank to the citation analysis in a large citation network. It offers a more integrated picture of the publications' influence in a specific field. We firstly calculate the PageRanks of scientific papers. The distributional characteristics and comparison with the traditionally used number of citations are then analyzed in detail. Furthermore, the PageRank is implemented in the evaluation of research influence for several countries in the field of Biochemistry and Molecular Biology during the time period of 2000-2005. Finally, some advantages of bringing PageRank to the citation analysis are concluded.
- Date
- 31. 7.2008 14:22:05
-
Wildner, B.: Web of Science - Scopus : Auf der Suche nach Zitierungen (2006)
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- Abstract
- Evaluation ist an der Medizinischen Universität Wien ein wichtiges Thema. So werden die Ressourcen innerhalb der Universität entsprechend der in den Leistungskriterien definierten Bewertungsmethode verteilt, deren Grundlage ein für jeden Fachbereich eigens berechneter normierter Impact Factor darstellt. Wissenschaftliche Leistung kann aber auch auf andere Art gemessen werden. Innerhalb einer Universitätsklinik oder Forschungsgruppe werden die Publikationen der wissenschaftlichen Mitarbeiter mittels Zitierungsanalyse bewertet. Für eine Bewerbung auf bestimmte Stellen müssen die einzelnen Wissenschaftler jeweils aktuelle Zitierungsanalysen vorlegen. Seit 2005 stellt die Universitätsbibliothek der Medizinischen Universität Wien am Campus die Datenbank Scopus zur Verfügung. Dabei handelt es sich nicht nur um eine weitere naturwissenschaftliche Literaturdatenbank, sondern um ein Konkurrenzprodukt zum Web of Science, dessen Schwerpunkt in der Suche der Referenzfelder liegt und so die Beantwortung der Fragestellung, wie oft eine wissenschaftliche Publikation zitiert wird, ermöglicht. Im seltenen Idealfall liegt eine vollständige Publikationsliste vor, von der ausgehend man eine Zitierungsanalyse starten kann. Meist aber besteht der Wunsch, nur anhand eines Autorennamens und dem Wissen, in welchem Fachgebiet jemand wissenschaftlich tätig ist, rasch die Suche nach Zitierungen zu beginnen. Im Web of Science führt der Weg über eine Cited Reference Search zu einem Cited Reference Index, aus dem man die Zitierzahlen (Times Cited) zu den einzelnen Publikationen eines Autors entnehmen kann. Als Cited Author scheinen neben dem Erstautor auch alle Mitautoren auf, vorausgesetzt die Zitierung bezieht sich auf eine Publikation, die als Source Item im Web of Science in dem Zeitraum erscheint, der für die Institution subskribiert wurde. Abschließend müssen die einzelnen Zitierzahlen eigenhändig addiert werden und ergeben so die Gesamtzahl der Zitierungen für einen bestimmten Autor. In Scopus wird nach einer Autorensuche ein Document Citation Overview geboten, der die Publikationen nach Erscheinungsjahr gereiht auflistet und gleichzeitig in einer Übersichtstabelle die Zitierzahlen pro Publikation und Jahr sowie die jeweiligen Gesamtzahlen angibt.
- Date
- 4. 6.2006 17:22:15
-
Kurtz, M.J.; Eichhorn, G.; Accomazzi, A.; Grant, C.; Demleitner, M.; Henneken, E.; Murray, S.S.: ¬The effect of use and access on citations (2005)
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- Source
- Information processing and management. 41(2005) no.6, S.1395-1402
- Year
- 2005
-
Trkulja, V.: Weltgrößte Abstracts- und Zitationsdatenbank aus dem wissenschaftlichen Web (2005)
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- Source
- Password. 2005, H.5, S.37-40
- Year
- 2005
-
Zhao, D.: Challenges of scholarly publications on the Web to the evaluation of science : a comparison of author visibility on the Web and in print journals (2005)
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- Source
- Information processing and management. 41(2005) no.6, S.1403-1418
- Year
- 2005
-
Nicolaisen, J.: Citation analysis (2007)
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- Date
- 13. 7.2008 19:53:22
-
Døsen, K.: One more reference on self-reference (1992)
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- Date
- 7. 2.2005 14:10:22
-
Frandsen, T.F.; Rousseau, R.: Article impact calculated over arbitrary periods (2005)
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- Source
- Journal of the American Society for Information Science and Technology. 56(2005) no.1, S.58-62
- Year
- 2005
-
Sombatsompop, N.; Markpin, T.: Making an equality of ISI impact factors for different subject fields (2005)
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- Source
- Journal of the American Society for Information Science and Technology. 56(2005) no.7, S.676-683
- Year
- 2005
-
Leydesdorff, L.; Bihui, J.: Mapping the Chinese Science Citation Database in terms of aggregated journal-journal citation relations (2005)
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- Source
- Journal of the American Society for Information Science and Technology. 56(2005) no.14, S.1469-1479
- Year
- 2005
-
Sidiropoulos, A.; Manolopoulos, Y.: ¬A new perspective to automatically rank scientific conferences using digital libraries (2005)
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- Source
- Information processing and management. 41(2005) no.2, S.289-312
- Year
- 2005
-
Marshakova-Shaikevich, I.: Bibliometric maps of field of science (2005)
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- Source
- Information processing and management. 41(2005) no.6, S.1534-1547
- Year
- 2005
-
Noruzi, A.: Google Scholar : the new generation of citation indexes (2005)
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- Source
- Libri. 55(2005) no.4, S.170-180
- Year
- 2005
-
Van der Veer Martens, B.: Do citation systems represent theories of truth? (2001)
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- Date
- 22. 7.2006 15:22:28
-
Bensman, S.J.: Distributional differences of the impact factor in the sciences versus the social sciences : an analysis of the probabilistic structure of the 2005 journal citation reports (2008)
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- Abstract
- This paper examines the probability structure of the 2005 Science Citation Index (SCI) and Social Sciences Citation Index (SSCI) Journal Citation Reports (JCR) by analyzing the Impact Factor distributions of their journals. The distribution of the SCI journals corresponded with a distribution generally modeled by the negative binomial distribution, whereas the SSCI distribution fit the Poisson distribution modeling random, rare events. Both Impact Factor distributions were positively skewed - the SCI much more so than the SSCI - indicating excess variance. One of the causes of this excess variance was that the journals highest in the Impact Factor in both JCRs tended to class in subject categories well funded by the National Institutes of Health. The main reason for the SCI Impact Factor distribution being more skewed than the SSCI one was that review journals defining disciplinary paradigms play a much more important role in the sciences than in the social sciences.
-
Vanclay, J.K.: On the robustness of the h-index (2007)
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- Abstract
- The h-index (Hirsch, 2005) is robust, remaining relatively unaffected by errors in the long tails of the citations-rank distribution, such as typographic errors that short-change frequently cited articles and create bogus additional records. This robustness, and the ease with which h-indices can be verified, support the use of a Hirsch-type index over alternatives such as the journal impact factor. These merits of the h-index apply both to individuals and to journals.
-
Vaughan, L.; Shaw, D.: Web citation data for impact assessment : a comparison of four science disciplines (2005)
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- Source
- Journal of the American Society for Information Science and Technology. 56(2005) no.10, S.1075-1087
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- 2005
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Lai, K.-K.; Wu, S.-J.: Using the patent co-citation approach to establish a new patent classification system (2005)
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- Information processing and management. 41(2005) no.2, S.313-330
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- 2005
-
Garfield, E.; Stock, W.G.: Citation Consciousness : Interview with Eugene Garfiels, chairman emeritus of ISI; Philadelphia (2002)
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- Source
- Password. 2002, H.6, S.22-25
