CWTS crown indicator measures citation impact of a research group's publication oeuvre
نویسنده
چکیده
The article “Caveats for the journal and field normalizations in the CWTS (“Leiden”) evaluations of research performance”, published by Tobias Opthof and Loet Leydesdorff (Opthof & Leydesdorff, 2010), denoted as O&L below, deals with a subject as important as the application of so called field normalized indicators of citation impact in the assessment of research performance of individual researchers and research groups. Field normalization aims to account for differences in citation practices across scientificscholarly subject fields.
منابع مشابه
Normalization at the field level: Fractional counting of citations
Van Raan et al. (2010) accepted our critique for the case of journal normalization (previously CPP/JCSm); CWTS has in the meantime adapted its procedures. However, a new indicator was proposed for field normalization (previously CPP/FCSm), called the “mean normalized citation score” (MNCS; cf. Lundberg, 2007). In our opinion, this latter change does not sufficiently resolve the problems. Since ...
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Tobias Opthof 1,2 & Loet Leydesdorff 3 Abstract In reaction to a previous critique (Opthof & Leydesdorff, 2010), the Center for Science and Technology Studies (CWTS) in Leiden proposed to change their old “crown” indicator in citation analysis into a new one. Waltman et al. (2011a) argue that this change does not affect rankings at various aggregated levels. However, CWTS data is not publicly a...
متن کاملRemaining problems with the "New Crown Indicator" (MNCS) of the CWTS
In their article, entitled “Towards a new crown indicator: some theoretical considerations,” Waltman et al. (2010) show that the “old crown indicator” of CWTS in Leiden was mathematically inconsistent and that one should move to the normalization as applied in the “new crown indicator.” Although we now agree about the statistical normalization (Opthof & Leydesdorff, 2010; Van Raan et al., 2010)...
متن کاملWhat Does it Mean that UCSB is Ranked Number 7 in the World in “ Research Impact ? ” Ted Bergstrom March 12 , 2012
has published the Leiden Ranking for 2011/2012 that " measures the scientific performance of 500 major universities worldwide. " They rank universities by several distinct criteria, based on publications by authors affiliated with the university, the journals in which they publish, and citations to works written in these journals. By the indicator that they call " the most important impact indi...
متن کاملNormalization, CWTS indicators, and the Leiden Rankings: Differences in citation behavior at the level of fields
Van Raan et al. (2010; arXiv:1003.2113) have proposed a new indicator (MNCS) for field normalization. Since field normalization is also used in the Leiden Rankings of universities, we elaborate our critique of journal normalization in Opthof & Leydesdorff (2010; arXiv:1002.2769) in this rejoinder concerning field normalization. Fractional citation counting thoroughly solves the issue of normali...
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ورودعنوان ژورنال:
- J. Informetrics
دوره 4 شماره
صفحات -
تاریخ انتشار 2010