New Leiden Ranking

[Loet Leydesdorff]

Dear Chudamani,

It seems to me that an indicator or ranking which allows for statitistical
testing of the significance of differences and positions is far superior to
one which does not (such as the h-index). Fortunately, these two major
teams in our field (Granada and Leiden University) have agreed on using
such an indicator for the Scopus and WoS databases, respectively.

Of course, there remains the problem of
interdisciplinarity/multidisciplinarity in institutional units such as
universities. One might say that a university can improve its average
citation score by closing the mathematics department. :-) This can be
counteracted a bit by field-normalization and perhaps by fractionation of
the citations (1/NRef) in the citigng papers.

Best wishes,
Loet

On Mon, Dec 12, 2011 at 11:30 AM, K S Chudamani
<ksc at library.iisc.ernet.in>wrote:

> Adminstrative info for SIGMETRICS (for example unsubscribe):
> http://web.utk.edu/~gwhitney/sigmetrics.html
>
> >
>
>
>
> dear all,
>
> I would like to point out that the elaborate method used is simply an
> extension of regular method. We have used h index and ranked universitires
> in India.it has been published in pearl journal. This also gives similar
> results. Then why break our head by complicatihg matters
>
> chudamani
>
>
> Adminstrative info for SIGMETRICS (for example unsubscribe):
> > http://web.utk.edu/~gwhitney/sigmetrics.html
> >
> > Dear colleagues,
> >
> >
> >
> > Using the newly introduced indicator for impact in the Leiden Rankings
> > 2011/2012 <http://www.leidenranking.com/ranking.aspx> —the Proportion
> > top-10% publications (PPtop 10%)—one can test differences between
> > institutions statistically using the z-test. Furthermore, one can test
> > whether each university performs above or below expectation.
> >
> >
> >
> > An Excel sheet with the test embedded is made available at
> > http://www.leydesdorff.net/leiden11/leiden11.xls and an example is
> > elaborated in a short introduction at
> > http://www.leydesdorff.net/leiden11/index.htm (coauthored with Lutz
> > Bornmann).
> >
> >
> >
> > The test was previously used analogously for the Excellence Indicator in
> > the SCImago Institutions Rankings
> > <http://www.scimagoir.com/pdf/sir_2011_world_report.pdf> ; cf.
> > http://www.leydesdorff.net/scimago11; Bornmann
> > <http://arxiv.org/ftp/arxiv/papers/1110/1110.2305.pdf> et al., in
> press),
> > and can be considered as additional to the stability intervals provided
> at
> > the webpages of the Leiden Ranking
> > <http://www.leidenranking.com/ranking.aspx> . The SCImago Rankings are
> > based on Scopus data, and the Leiden Ranking on Web-of-Science data.
> >
> >
> >
> > With best wishes,
> >
> > Loet
> >
> >
> >
> >   _____
> >
> > Amsterdam School of Communications Research (ASCoR),
> > Kloveniersburgwal 48, 1012 CX Amsterdam.
> > Tel.: +31-20- 525 6598; fax: +31-842239111
> >  <mailto:loet at leydesdorff.net> loet at leydesdorff.net ;
> > <http://www.leydesdorff.net/> http://www.leydesdorff.net/ ;
> > <http://scholar.google.com/citations?user=ych9gNYAAAAJ&hl=en>
> > http://scholar.google.com/citations?user=ych9gNYAAAAJ&hl=en
> >
> >
> >
> > From: ASIS&T Special Interest Group on Metrics
> > [mailto:SIGMETRICS at LISTSERV.UTK.EDU] On Behalf Of Paul Wouters
> > Sent: Friday, December 09, 2011 11:58 AM
> > To: SIGMETRICS at LISTSERV.UTK.EDU
> > Subject: [SIGMETRICS] New Leiden Ranking
> >
> >
> >
> > Adminstrative info for SIGMETRICS (for example unsubscribe):
> > http://web.utk.edu/~gwhitney/sigmetrics.html Dear colleagues
> >
> > US still dominates high impact publications in science
> >
> >
> >
> > The US are still the dominant scientific world power, but new centres of
> > science are emerging. MIT is the university which has the highest
> citation
> > impact of its publications in the world. Princeton and Harvard take
> > positions two and three. These are some of the findings of the new Leiden
> > Ranking 2011 – 2012 which has been published on the website:
> > www.leidenranking.com <http://www.leidenranking.com/> . The top fifty
> list
> > consists of 42 US based universities, 2 Swiss (Lausanne at 12 and ETH
> > Zurich at 18), 1 Israeli (Weizmann Institute of Science), 4 British
> > (Cambridge at 31, London School of Hygiene & Tropical Medicine at 33,
> > Oxford at 36 and Durham at 42), and one Danish university (Technical
> > University of Denmark). Aggregated to country level, the US has 64
> > universities in the top 100 list, the UK 12, and the Netherlands 7. The
> > latter is remarkable given its small size.
> >
> >
> >
> > The Leiden Ranking 2011-2012 is based on an advanced methodology which
> > compensates for distorting effects due to the size of the university, the
> > differences in citation characteristics between scientific fields,
> > differences between English and non-English publications, and distorting
> > effects of extremely high cited publications. Publications authored by
> > researchers at different universities are attributed to the universities
> > as fractions. This prevents distortion of the ranking by counting these
> > publications multiple times (for each co-authoring university). This
> > distorting effect is often overseen in other global university rankings,
> > which leads to a relative advantage of clinical research and some physics
> > fields in these rankings. This makes clear how sensitive global rankings
> > are to the nitty-gritty of the calculations.
> >
> >
> >
> > The Leiden Ranking enables users to choose the criteria on which they
> wish
> > to compare university performance. The menu offers 3 indicators of impact
> > and 4 indicators of scientific collaboration. When scored on the
> > percentage of their papers produced in collaboration with institutes in
> > different countries, the London School of Hygiene & Tropical Medicine
> tops
> > the list with more than 50 % of its publications co-authored with other
> > countries.
> >
> >
> >
> > Although in terms of impact, US universities are still strongest, it is
> > clear that other countries are emerging as centres of science by looking
> > at the total production (number of publications in the Web of Science).
> In
> > this ranking, Harvard University is number one. But in the top 25 we also
> > see universities from Canada (Toronto at 2, British Columbia at 22),
> Japan
> > (Tokyo at 4, Kyoto at 11, Osaka at 25), Brazil (Sao Paulo at 8), United
> > Kingdom (Cambridge at 13, Oxford at 14, University College at 17), South
> > Korea (Seoul at 19), and China (Zhejiang at 20).
> >
> >
> >
> > The Leiden Ranking is the first global university ranking which has
> > published the details of its methodology and indicators. The indicators
> > are presented in combination with stability intervals, an advanced
> > statistical method to measure to what extent the differences in rankings
> > between universities are significant.
> >
> >
> >
> > If one wishes to compare the university citation impact in a global
> > context, it is best to take the percentage of papers in the top 10 %
> > highly cited papers together with the calculation method “fractional
> > counting†. This is the method which compares across institutions and
> > fields in the fairest way.
> >
> >
> >
> > The Leiden Ranking is based on data of the Web of Science. Data on the
> > arts and humanities are not included since these fields are not well
> > represented in the Web of Science. The Leiden Ranking exclusively
> measures
> > the citation impact of research of the 500 largest universities in the
> > world. This prevents an arbritrary combination of performance in
> > education, valorization and research, a disadvantage of many global
> > university rankings.
> >
> >
> >
> > More information about the ranking results and its methodology:
> > www.leidenranking.com <http://www.leidenranking.com/> .
> >
> >
> >
> > With regards
> >
> > Paul Wouters
> > Professor of Scientometrics
> > Director Centre for Science and Technology Studies
> > Leiden University
> >
> > Visiting address:
> > Willem Einthoven Building
> > Wassenaarseweg 62A
> > 2333 AL Leiden
> > Mail address: P.O. Box 905
> > 2300 AX Leiden
> > T: +31 71 5273909 (secr.)
> > F: +31 71 5273911
> > E: p.f.wouters at cwts.leidenuniv.nl
> >
> > CWTS home page: www.cwts.nl
> > Blog about Citation Cultures: http://citationculture.wordpress.com/
> > <http://citationculture.wordpress.com/>
> > Research Dreams: www.researchdreams.nl
> >
> >
> > --
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> >
>
>
>
>
> --
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-- 
Professor Loet Leydesdorff
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam
Tel.: +31-20- 525 6598; fax: +31-20- 525 3681
loet at leydesdorff.net ; http://www.leydesdorff.net/
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