Document Detail

Towards a new crown indicator: an empirical analysis.
MedLine Citation:
PMID:  21654898     Owner:  NLM     Status:  Publisher    
We present an empirical comparison between two normalization mechanisms for citation-based indicators of research performance. These mechanisms aim to normalize citation counts for the field and the year in which a publication was published. One mechanism is applied in the current so-called crown indicator of our institute. The other mechanism is applied in the new crown indicator that our institute is currently exploring. We find that at high aggregation levels, such as at the level of large research institutions or at the level of countries, the differences between the two mechanisms are very small. At lower aggregation levels, such as at the level of research groups or at the level of journals, the differences between the two mechanisms are somewhat larger. We pay special attention to the way in which recent publications are handled. These publications typically have very low citation counts and should therefore be handled with special care.
Ludo Waltman; Nees Jan van Eck; Thed N van Leeuwen; Martijn S Visser; Anthony F J van Raan
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-24
Journal Detail:
Title:  Scientometrics     Volume:  87     ISSN:  0138-9130     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-6-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7901197     Medline TA:  Scientometrics     Country:  -    
Other Details:
Languages:  ENG     Pagination:  467-481     Citation Subset:  -    
Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands.
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