New Letter to the Editor
loet at LEYDESDORFF.NET
Sun Mar 29 10:17:00 EDT 2015
This letter is remarkable because you plead for using the Mean Normalized Citation Score MNCS. But:
1. Why should one use the mean of a highly skewed distribution? In other papers, you argued in favour of using percentile rank classes. At least, one could use the top-10% or the median as a non-parametric alternative.
2. It is far from clear how one should normalize. Normalization presumes reference sets. One often use Web-of-Science Subject Categories for this, but these have been shown to be sometimes very heterogeneous, and in other cases overlapping. I would not advise to use them for evaluation purposes because one may end up with a lot of error.
The Leiden Rankings 2014 are for these reasons (among others) no longer based on MNCS (as they were in 2013). You argue that these are de-facto standards, but why should one continue to use de-facto standards that are not valid?
Bornmann, L., & Mutz, R. (2011). Further steps towards an ideal method of measuring citation performance: The avoidance of citation (ratio) averages in field-normalization. Journal of Informetrics, 5(1), 228-230.
Loet Leydesdorff and Lutz Bornmann, The Operationalization of <http://arxiv.org/abs/1407.7849> "Fields" as WoS Subject Categories (WCs) in Evaluative Bibliometrics: The cases of "Library and Information Science" and "Science & Technology Studies", Journal of the Association for Information Science and Technology (in press); doi: 10.1002/asi.23408 <http://doi.org/10.1002/asi.23408>
Emeritus University of Amsterdam
Amsterdam School of Communications Research (ASCoR)
<mailto:loet at leydesdorff.net> loet at leydesdorff.net ; <http://www.leydesdorff.net/> http://www.leydesdorff.net/
Honorary Professor, <http://www.sussex.ac.uk/spru/> SPRU, University of Sussex;
Guest Professor <http://www.zju.edu.cn/english/> Zhejiang Univ., Hangzhou; Visiting Professor, <http://www.istic.ac.cn/Eng/brief_en.html> ISTIC, Beijing;
Visiting Professor, <http://www.bbk.ac.uk/> Birkbeck, University of London;
From: ASIS&T Special Interest Group on Metrics [mailto:SIGMETRICS at LISTSERV.UTK.EDU] On Behalf Of Bornmann, Lutz
Sent: Sunday, March 29, 2015 3:22 PM
To: SIGMETRICS at LISTSERV.UTK.EDU
Subject: [SIGMETRICS] New Letter to the Editor
Bornmann, L. (in press). Nature’s top 100 revisited. Journal of the Association for Information Science and Technology
Recently, Van Noorden, Maher, and Nuzzo (2014) published a list of papers which are among the 100 most highly cited papers of all time. This letter argues that such a list should not be produced on the base of bare citation counts, but normalized bibliometric indicators – the standard in bibliometrics.
Dr. Dr. habil. Lutz Bornmann
Division for Science and Innovation Studies
Administrative Headquarters of the Max Planck Society
Tel.: +49 89 2108 1265
Mobil: +49 170 9183667
Email: bornmann at gv.mpg.de
WWW: <http://www.lutz-bornmann.de/> www.lutz-bornmann.de
ResearcherID: <http://www.researcherid.com/rid/A-3926-2008> http://www.researcherid.com/rid/A-3926-2008
ResearchGate: <http://www.researchgate.net/profile/Lutz_Bornmann> http://www.researchgate.net/profile/Lutz_Bornmann
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