995 citations · 2.4k across the 265 of their papers we have counts for
29 papers · 1 filter
Visualization and Analysis of Frames in Collections of Messages: Content Analysis and the Measurement of Meaning
Esther Vlieger, Loet Leydesdorff
A step-to-step introduction is provided on how to generate a semantic map from a collection of messages (full texts, paragraphs or statements) using freely available software and/o…
Percentile Ranks and the Integrated Impact Indicator (I3)
Loet Leydesdorff, Lutz Bornmann
We tested Rousseau's (in press) recent proposal to define percentile classes in the case of the Integrated Impact Indicator (I3) so that the largest number in a set always belongs…
Testing Differences Statistically with the Leiden Ranking
Loet Leydesdorff, Lutz Bornmann
The Leiden Ranking 2011/2012 provides the Proportion top-10% publications (PP top 10%) as a new indicator. This indicator allows for testing the difference between two ranks for st…
The new Excellence Indicator in the World Report of the SCImago Institutions Rankings 2011
Lutz Bornmann, Felix de Moya-Anegón, Loet Leydesdorff
The new excellence indicator in the World Report of the SCImago Institutions Rankings (SIR) makes it possible to test differences in the ranking in terms of statistical significanc…
Betweenness Centrality as a Driver of Preferential Attachment in the Evolution of Research Collaboration Networks
Alireza Abbasi, Liaquat Hossain, Loet Leydesdorff
We analyze whether preferential attachment in scientific coauthorship networks is different for authors with different forms of centrality. Using a complete database for the scient…
The Disclosure of University Research for Third Parties: A Non-Market Perspective on an Italian University
Michelina Venditti, Emanuela Reale, Loet Leydesdorff
Nations, universities, and regional governments commit resources to promote the dissemination of scientific and technical knowledge. One focuses on knowledge-based innovations and…
Mapping (USPTO) Patent Data using Overlays to Google Maps
Loet Leydesdorff, Lutz Bornmann
A technique is developed using patent information available online (at the US Patent and Trademark Office) for the generation of Google Maps. The overlays indicate both the quantit…
World Shares of Publications of the USA, EU-27, and China Compared and Predicted using the New Interface of the Web-of-Science versus Scopus
Loet Leydesdorff
The new interface of the Web of Science (of Thomson Reuters) enables users to retrieve sets larger than 100,000 documents in a single search. This makes it possible to compare publ…
Which cities' paper output and citation impact are above expectation in information science? Some improvements of our previous mapping approaches
Lutz Bornmann, Loet Leydesdorff
Bornmann and Leydesdorff (in press) proposed methods based on Web-of-Science data to identify field-specific excellence in cities where highly-cited papers were published more freq…
Sociological and Communication-Theoretical Perspectives on the Commercialization of the Sciences
Loet Leydesdorff
Both self-organization and organization are important for the further development of the sciences: the two dynamics condition and enable each other. Commercial and public considera…
Where is Synergy Indicated in the Norwegian Innovation System? Triple-Helix Relations among Technology, Organization, and Geography
Øivind Strand, Loet Leydesdorff
Using information theory and data for all (0.5 million) Norwegian firms, the national and regional innovation systems are decomposed into three subdynamics: (i) economic wealth gen…
An Evaluation of Impacts in "Nanoscience & nanotechnology:" Steps towards standards for citation analysis
Loet Leydesdorff
One is inclined to conceptualize impact in terms of citations per publication, and thus as an average. However, citation distributions are skewed, and the average has the disadvant…
A Rejoinder on Energy versus Impact Indicators
Loet Leydesdorff, Tobias Opthof
Citation distributions are so skewed that using the mean or any other central tendency measure is ill-advised. Unlike G. Prathap's scalar measures (Energy, Exergy, and Entropy or E…
Innovation Systems as Patent Networks: The Netherlands, India and Nanotech
Wilfred Dolfsma, Loet Leydesdorff
Research in the domain of 'Innovation Studies' has been claimed to allow for the study of how technology will develop in the future. Some suggest that the National and Sectoral Inn…
Which are the best cities for psychology research worldwide? A map visualizing city ratios of observed and expected numbers of highly-cited papers
Lutz Bornmann, Loet Leydesdorff, Günter Krampen
We present scientometric results about world-wide centers of excellence in psychology. Based on Web of Science data, domain-specific excellence can be identified for cities where h…
Hyperincursive Cogitata and Incursive Cogitantes: Scholarly Discourse as a Strongly Anticipatory System
Loet Leydesdorff
Strongly anticipatory systems-that is, systems which use models of themselves for their further development-and which additionally may be able to run hyperincursive routines-that i…
Mapping excellence in the geography of science: An approach based on Scopus data
Lutz Bornmann, Loet Leydesdorff, Christiane Walch-Solimena +1
As research becomes an ever more globalized activity, there is growing interest in national and international comparisons of standards and quality in different countries and region…
Book review: Katy Börner, Atlas of Science: Visualizing What We Know. Cambridge, MA/ London UK: The MIT Press, 2010
Loet Leydesdorff
Katy Börner has written a wonderful book about visualization that makes our field of scientometrics accessible to much larger audiences. The book is to be read in relation to the o…
Interactive Overlays: A New Method for Generating Global Journal Maps from Web-of-Science Data
Loet Leydesdorff, Ismael Rafols
Recent advances in methods and techniques enable us to develop an interactive overlay to the global map of science based on aggregated citation relations among the 9,162 journals c…
How journal rankings can suppress interdisciplinary research. A comparison between Innovation Studies and Business & Management
Ismael Rafols, Loet Leydesdorff, Alice O'Hare +2
This study provides quantitative evidence on how the use of journal rankings can disadvantage interdisciplinary research in research evaluations. Using publication and citation dat…
Integrated Impact Indicators (I3) compared with Impact Factors (IFs): An alternative research design with policy implications
Loet Leydesdorff, Lutz Bornmann
In bibliometrics, the association of "impact" with central-tendency statistics is mistaken. Impacts add up, and citation curves should therefore be integrated instead of averaged.…
Which cities produce excellent papers worldwide more than can be expected? A new mapping approach--using Google Maps--based on statistical significance testing
Lutz Bornmann, Loet Leydesdorff
The methods presented in this paper allow for a statistical analysis revealing centers of excellence around the world using programs that are freely available. Based on Web of Scie…
Publish or Patent: Bibliometric evidence for empirical trade-offs in national funding strategies
Robert D. Shelton, Loet Leydesdorff
Multivariate linear regression models suggest a trade-off in allocations of national R&D investments. Government funding, and spending in the higher education sector, seem to encou…
Citation analysis cannot legitimate the strategic selection of excellence
Tobias Opthof, Loet Leydesdorff
In reaction to a previous critique(Opthof & Leydesdorff, 2010), the Center for Science and Technology Studies (CWTS) in Leiden proposed to change their old "crown" indicator in cit…