CWTS Leiden Ranking 2015

Loet Leydesdorff loet at LEYDESDORFF.NET
Wed May 20 15:28:14 EDT 2015

Dear Nees Jan, 


As always impressive! Thank you.


Are the approximately 4,000 fields also visible in one way or another? Do I
correctly understand that MNCS is defined in relation to these 4,000 fields
and not to the 251 WCs? Is there a concordance table between the fields and
WCs as there is between WCs and five broad fields in the Excel sheet? 


I think that I understand from your and Ludo's previous publications how the
4,000 fields are generated. Why are there 4,000 such fields in 2015, and
800+ in 2014? Isn't it amazing that trends can despite the discontinuities
be smooth? Or are indicators robust across these scales?


Best wishes, 




Loet Leydesdorff 

Emeritus University of Amsterdam
Amsterdam School of Communication Research (ASCoR)

 <mailto:loet at> loet at ;
Honorary Professor,  <> SPRU, University of

Guest Professor  <> Zhejiang Univ., Hangzhou;
Visiting Professor,  <> ISTIC,

Visiting Professor,  <> Birkbeck, University of London;



From: ASIS&T Special Interest Group on Metrics
[mailto:SIGMETRICS at LISTSERV.UTK.EDU] On Behalf Of Eck, N.J.P. van
Sent: Wednesday, May 20, 2015 8:27 PM
Subject: [SIGMETRICS] CWTS Leiden Ranking 2015


Release of the CWTS Leiden Ranking 2015

Today CWTS has released the 2015 edition of the Leiden Ranking. The CWTS
Leiden Ranking 2015 offers key insights into the scientific performance of
750 major universities worldwide. A sophisticated set of bibliometric
indicators provides statistics on the scientific impact of universities and
on universities' involvement in scientific collaboration. The CWTS Leiden
Ranking 2015 is based on Web of Science indexed publications from the period


Improvements and new features in the 2015 edition

Compared with the 2014 edition of the Leiden Ranking, the 2015 edition
includes a number of enhancements. First of all, the 2015 edition offers the
possibility to perform trend analyses. Bibliometric statistics are available
not only for the period 2010-2013 but also for earlier periods. Second, the
2015 edition of the Leiden Ranking provides new impact indicators based on
counting publications that belong to the top 1% or top 50% of their field.
And third, improvements have been made to the presentation of the ranking.
Size-dependent indicators are presented in a more prominent way, and it is
possible to obtain a convenient one-page overview of all bibliometric
statistics for a particular university.


Differences with other university rankings

Compared with other university rankings, the Leiden Ranking offers more
advanced indicators of scientific impact and collaboration and uses a more
transparent methodology. The Leiden Ranking does not rely on highly
subjective data obtained from reputational surveys or on data provided by
universities themselves. Also, the Leiden Ranking refrains from aggregating
different dimensions of university performance into a single overall



The Leiden Ranking is available at




Nees Jan van Eck PhD


Head of ICT


Centre for Science and Technology Studies

Leiden University

P.O. Box 905

2300 AX Leiden

The Netherlands


Willem Einthoven Building, Room B5-35

Tel: +31 (0)71 527 6445

Fax: +31 (0)71 527 3911

E-mail:  <mailto:ecknjpvan at> ecknjpvan at

Homepage:  <>

VOSviewer:  <>





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