Document (#29420)

Author

Nederhof, A.J.
Visser, M.S.

Title

Quantitative deconstruction of citation impact indicators : waxing field impact but waning journal impact

Source

Journal of documentation. 60(2004) no.6, S.658-672

Year

2004

Abstract

In two case studies of research units, reference values used to benchmark research performance appeared to show contradictory results: the average citation level in the subfields (FCSm) increased world-wide, while the citation level of the journals (JCSm) decreased, where concomitant changes were expected. Explanations were sought in: a shift in preference of document types; a change in publication preference for subfields; and changes in journal coverage. Publishing in newly covered journals with a low impact had a negative effect on impact ratios. However, the main factor behind the increase in FCSm was the distribution of articles across the five-year block periods that were studied. Publication in lower impact journals produced a lagging JCSm. Actual values of JCSm, FCSm, and citations per publication (CPP) values are not very informative either about research performance, or about the development of impact over time in a certain subfield with block indicators. Normalized citation impact indicators are free from such effects and should be consulted primarily in research performance assessments.

Footnote

Vgl. auch unter: http://www.emeraldinsight.com/10.1108/00220410410568142.

Theme

Informetrie
Citation indexing

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5. Heneberg, P.: Parallel worlds of citable documents and others : inflated commissioned opinion articles enhance scientometric indicators (2014) 0.26

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