Loet Leydesdorff

2021

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The measurement of "interdisciplinarity" and "synergy" in scientific and extra-scientific collaborations.
Loet Leydesdorff|Inga A. Ivanova
Journal of the Association for Information Science and Technology (JASIST) 2021 Volume 72 Issue 4

2020

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Automated analysis of actor-topic networks on twitter: New approaches to the analysis of socio-semantic networks.
Iina Hellsten|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2020 Volume 71 Issue 1

2019

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Synergy in the knowledge base of U.S. innovation systems at national, state, and regional levels: The contributions of high-tech manufacturing and knowledge-intensive services.
Loet Leydesdorff|Caroline S. Wagner|Igone Porto Gómez|Jordan A. Comins|Fred Y. Phillips
Journal of the Association for Information Science and Technology (JASIST) 2019 Volume 70 Issue 10
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The Relative Influences of Government Funding and International Collaboration on Citation Impact.
Loet Leydesdorff|Lutz Bornmann|Caroline S. Wagner
Journal of the Association for Information Science and Technology (JASIST) 2019 Volume 70 Issue 2
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Statistical significance and effect sizes of differences among research universities at the level of nations and worldwide based on the leiden rankings.
Loet Leydesdorff|Lutz Bornmann|John Mingers
Journal of the Association for Information Science and Technology (JASIST) 2019 Volume 70 Issue 5

2018

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Toward a calculus of redundancy: Signification, codification, and anticipation in cultural evolution.
Loet Leydesdorff|Mark William Johnson|Inga A. Ivanova
Journal of the Association for Information Science and Technology (JASIST) 2018 Volume 69 Issue 10

2017

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Can "hot spots" in the sciences be mapped using the dynamics of aggregated journal-journal citation Relations?
Loet Leydesdorff|Wouter de Nooy
Journal of the Association for Information Science and Technology (JASIST) 2017 Volume 68 Issue 1
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Strategic intelligence on emerging technologies: Scientometric overlay mapping.
Daniele Rotolo|Ismael Ràfols|Michael M. Hopkins|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2017 Volume 68 Issue 1
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Co-word maps and topic modeling: A comparison using small and medium-sized corpora (N < 1, 000).
Loet Leydesdorff|Adina Nerghes
Journal of the Association for Information Science and Technology (JASIST) 2017 Volume 68 Issue 4
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Identification of long-term concept-symbols among citations: Do common intellectual histories structure citation behavior?
Jordan A. Comins|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2017 Volume 68 Issue 5

2016

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The normalization of occurrence and Co-occurrence matrices in bibliometrics using Cosine similarities and Ochiai coefficients.
Qiuju Zhou|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2016 Volume 67 Issue 11
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Highly cited papers in Library and Information Science (LIS): Authors, institutions, and network structures.
Johann Bauer|Loet Leydesdorff|Lutz Bornmann
Journal of the Association for Information Science and Technology (JASIST) 2016 Volume 67 Issue 12
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The operationalization of "fields" as WoS subject categories (WCs) in evaluative bibliometrics: The cases of "library and information science" and "science & technology studies".
Loet Leydesdorff|Lutz Bornmann
Journal of the Association for Information Science and Technology (JASIST) 2016 Volume 67 Issue 3
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Journal portfolio analysis for countries, cities, and organizations: Maps and comparisons.
Loet Leydesdorff|Gaston Heimeriks|Daniele Rotolo
Journal of the Association for Information Science and Technology (JASIST) 2016 Volume 67 Issue 3
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Replicability and the public/private divide.
Loet Leydesdorff|Caroline S. Wagner|Lutz Bornmann
Journal of the Association for Information Science and Technology (JASIST) 2016 Volume 67 Issue 7
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The construction of interdisciplinarity: The development of the knowledge base and programmatic focus of the journal Climatic Change, 1977-2013.
Iina Hellsten|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2016 Volume 67 Issue 9
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Aggregated journal-journal citation relations in scopus and web of science matched and compared in terms of networks, maps, and interactive overlays.
Loet Leydesdorff|Félix de Moya-Anegón|Wouter de Nooy
Journal of the Association for Information Science and Technology (JASIST) 2016 Volume 67 Issue 9

2015

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Matching Medline/PubMed data with Web of Science: A routine in R language.
Daniele Rotolo|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2015 Volume 66 Issue 10
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Journal maps, interactive overlays, and the measurement of interdisciplinarity on the basis of Scopus data (1996-2012).
Loet Leydesdorff|Félix de Moya-Anegón|Vicente P. Guerrero-Bote
Journal of the Association for Information Science and Technology (JASIST) 2015 Volume 66 Issue 5
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Measuring triple-helix synergy in the Russian innovation systems at regional, provincial, and national levels.
Loet Leydesdorff|Evgeniy Perevodchikov|Alexander Uvarov
Journal of the Association for Information Science and Technology (JASIST) 2015 Volume 66 Issue 6
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BRICS countries and scientific excellence: A bibliometric analysis of most frequently cited papers.
Lutz Bornmann|Caroline S. Wagner|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2015 Volume 66 Issue 7

2014

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Interdisciplinarity at the journal and specialty level: The changing knowledge bases of the journal cognitive science.
Loet Leydesdorff|Robert L. Goldstone
Journal of the Association for Information Science and Technology (JASIST) 2014 Volume 65 Issue 1
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International coauthorship relations in the Social Sciences Citation Index: Is internationalization leading the Network?
Loet Leydesdorff|Han Woo Park|Caroline S. Wagner
Journal of the Association for Information Science and Technology (JASIST) 2014 Volume 65 Issue 10
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In search of a network theory of innovations: Relations, positions, and perspectives.
Loet Leydesdorff|Petra Ahrweiler
Journal of the Association for Information Science and Technology (JASIST) 2014 Volume 65 Issue 11
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Patterns of connections and movements in dual-map overlays: A new method of publication portfolio analysis.
Chaomei Chen|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2014 Volume 65 Issue 2
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Mutual redundancies in interhuman communication systems: Steps toward a calculus of processing meaning.
Loet Leydesdorff|Inga A. Ivanova
Journal of the Association for Information Science and Technology (JASIST) 2014 Volume 65 Issue 2
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Group-based trajectory modeling (GBTM) of citations in scholarly literature: Dynamic qualities of "transient" and "sticky knowledge claims".
Susanne E. Baumgartner|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2014 Volume 65 Issue 4
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Detecting the historical roots of research fields by reference publication year spectroscopy (RPYS).
Werner Marx|Lutz Bornmann|Andreas Barth|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2014 Volume 65 Issue 4
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The "academic trace" of the performance matrix: A mathematical synthesis of the h-index and the integrated impact indicator (I3).
Fred Y. Ye|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2014 Volume 65 Issue 4

2013

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How can journal impact factors be normalized across fields of science? An assessment in terms of percentile ranks and fractional counts.
Loet Leydesdorff|Ping Zhou|Lutz Bornmann
Journal of the Association for Information Science and Technology (JASIST) 2013 Volume 64 Issue 1
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Field-normalized impact factors (IFs): A comparison of rescaling and fractionally counted IFs.
Loet Leydesdorff|Filippo Radicchi|Lutz Bornmann|Claudio Castellano|Wouter de Nooy
Journal of the Association for Information Science and Technology (JASIST) 2013 Volume 64 Issue 11
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The Triple Helix of university-industry-government relations at the country level and its dynamic evolution under the pressures of globalization.
Fred Y. Ye|Susan S. Yu|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2013 Volume 64 Issue 11
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Interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal-journal citations.
Loet Leydesdorff|Ismael Ràfols|Chaomei Chen
Journal of the Association for Information Science and Technology (JASIST) 2013 Volume 64 Issue 12
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Citation analysis with medical subject Headings (MeSH) using the Web of Knowledge: A new routine.
Loet Leydesdorff|Tobias Opthof
Journal of the Association for Information Science and Technology (JASIST) 2013 Volume 64 Issue 5
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Statistical tests and research assessments: A comment on Schneider (2012).
Lutz Bornmann|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2013 Volume 64 Issue 6
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The Swedish system of innovation: Regional synergies in a knowledge-based economy.
Loet Leydesdorff|Øivind Strand
Journal of the Association for Information Science and Technology (JASIST) 2013 Volume 64 Issue 9

2012

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Accounting for the uncertainty in the evaluation of percentile ranks.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2012 Volume 63 Issue 11
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Bibliometric perspectives on medical innovation using the medical subject Headings of PubMed.
Loet Leydesdorff|Daniele Rotolo|Ismael Ràfols
Journal of the Association for Information Science and Technology (JASIST) 2012 Volume 63 Issue 11
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Publish or patent: Bibliometric evidence for empirical trade-offs in national funding strategies.
Robert D. Shelton|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2012 Volume 63 Issue 3
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Mapping (USPTO) patent data using overlays to Google Maps.
Loet Leydesdorff|Lutz Bornmann
Journal of the Association for Information Science and Technology (JASIST) 2012 Volume 63 Issue 7
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Percentile ranks and the integrated impact indicator (I3).
Loet Leydesdorff|Lutz Bornmann
Journal of the Association for Information Science and Technology (JASIST) 2012 Volume 63 Issue 9

2011

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Scopus' SNIP indicator: Reply to Moed.
Loet Leydesdorff|Tobias Opthof
Journal of the Association for Information Science and Technology (JASIST) 2011 Volume 62 Issue 1
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Which cities produce more excellent papers than can be expected? A new mapping approach, using Google Maps, based on statistical significance testing.
Lutz Bornmann|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2011 Volume 62 Issue 10
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Integrated impact indicators compared with impact factors: An alternative research design with policy implications.
Loet Leydesdorff|Lutz Bornmann
Journal of the Association for Information Science and Technology (JASIST) 2011 Volume 62 Issue 11
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The structure of the Arts & Humanities Citation Index: A mapping on the basis of aggregated citations among 1, 157 journals.
Loet Leydesdorff|Björn Hammarfelt|Almila Akdag Salah
Journal of the Association for Information Science and Technology (JASIST) 2011 Volume 62 Issue 12
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How fractional counting of citations affects the impact factor: Normalization in terms of differences in citation potentials among fields of science.
Loet Leydesdorff|Lutz Bornmann
Journal of the Association for Information Science and Technology (JASIST) 2011 Volume 62 Issue 2
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Local emergence and global diffusion of research technologies: An exploration of patterns of network formation.
Loet Leydesdorff|Ismael Ràfols
Journal of the Association for Information Science and Technology (JASIST) 2011 Volume 62 Issue 5
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How to evaluate universities in terms of their relative citation impacts: Fractional counting of citations and the normalization of differences among disciplines.
Loet Leydesdorff|Jung C. Shin
Journal of the Association for Information Science and Technology (JASIST) 2011 Volume 62 Issue 6
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Turning the tables on citation analysis one more time: Principles for comparing sets of documents.
Loet Leydesdorff|Lutz Bornmann|Rüdiger Mutz|Tobias Opthof
Journal of the Association for Information Science and Technology (JASIST) 2011 Volume 62 Issue 7

2010

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The communication of meaning and the structuration of expectations: Giddens' "structuration theory" and Luhmann's "self-organization".
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2010 Volume 61 Issue 10
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Scopus's source normalized impact per paper (SNIP) versus a journal impact factor based on fractional counting of citations.
Loet Leydesdorff|Tobias Opthof
Journal of the Association for Information Science and Technology (JASIST) 2010 Volume 61 Issue 11
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Journal maps on the basis of Scopus data: A comparison with the Journal Citation Reports of the ISI.
Loet Leydesdorff|Félix de Moya-Anegón|Vicente P. Guerrero-Bote
Journal of the Association for Information Science and Technology (JASIST) 2010 Volume 61 Issue 2
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Maps on the basis of the Arts & Humanities Citation Index: The journals Leonardo and Art Journal versus "digital humanities" as a topic.
Loet Leydesdorff|Alkim Almila Akdag Salah
Journal of the Association for Information Science and Technology (JASIST) 2010 Volume 61 Issue 4
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A comparative study on communication structures of Chinese journals in the social sciences.
Ping Zhou|Xinning Su|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2010 Volume 61 Issue 7
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Mapping the geography of science: Distribution patterns and networks of relations among cities and institutes.
Loet Leydesdorff|Olle Persson
Journal of the Association for Information Science and Technology (JASIST) 2010 Volume 61 Issue 8
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Science overlay maps: A new tool for research policy and library management.
Ismael Ràfols|Alan L. Porter|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2010 Volume 61 Issue 9

2009

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An indicator of research front activity: Measuring intellectual organization as uncertainty reduction in document sets.
Diana Lucio-Arias|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2009 Volume 60 Issue 12
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A global map of science based on the ISI subject categories.
Loet Leydesdorff|Ismael Ràfols
Journal of the Association for Information Science and Technology (JASIST) 2009 Volume 60 Issue 2
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National and international dimensions of the Triple Helix in Japan: University-industry-government versus international coauthorship relations.
Loet Leydesdorff|Yuan Sun
Journal of the Association for Information Science and Technology (JASIST) 2009 Volume 60 Issue 4
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The relation between Pearson's correlation coefficient r and Salton's cosine measure.
Leo Egghe|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2009 Volume 60 Issue 5
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Definition and identification of journals as bibliographic and subject entities: Librarianship versus ISI Journal Citation Reports methods and their effect on citation measures.
Stephen J. Bensman|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2009 Volume 60 Issue 6
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How are new citation-based journal indicators adding to the bibliometric toolbox?
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2009 Volume 60 Issue 7
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The delineation of an interdisciplinary specialty in terms of a journal set: The case of communication studies.
Loet Leydesdorff|Carole Probst
Journal of the Association for Information Science and Technology (JASIST) 2009 Volume 60 Issue 8
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Content-based and algorithmic classifications of journals: Perspectives on the dynamics of scientific communication and indexer effects.
Ismael Ràfols|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2009 Volume 60 Issue 9

2008

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On the normalization and visualization of author co-citation data: Salton's Cosine versus the Jaccard index.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2008 Volume 59 Issue 1
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Patent classifications as indicators of intellectual organization.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2008 Volume 59 Issue 10
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Dynamic animations of journal maps: Indicators of structural changes and interdisciplinary developments.
Loet Leydesdorff|Thomas Schank
Journal of the Association for Information Science and Technology (JASIST) 2008 Volume 59 Issue 11
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Main-path analysis and path-dependent transitions in HistCiteTM-based historiograms.
Diana Lucio-Arias|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2008 Volume 59 Issue 12
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Caveats for the use of citation indicators in research and journal evaluations.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2008 Volume 59 Issue 2
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Co-word analysis using the Chinese character set.
Loet Leydesdorff|Ping Zhou
Journal of the Association for Information Science and Technology (JASIST) 2008 Volume 59 Issue 9

2007

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Visualization of the citation impact environments of scientific journals: An online mapping exercise.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2007 Volume 58 Issue 1
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Should co-occurrence data be normalized? A rejoinder.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2007 Volume 58 Issue 14
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A comparison between the China Scientific and Technical Papers and Citations Database and the Science Citation Index in terms of journal hierarchies and interjournal citation relations.
Ping Zhou|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2007 Volume 58 Issue 2
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Betweenness centrality as an indicator of the interdisciplinarity of scientific journals.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2007 Volume 58 Issue 9

2006

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Classification and powerlaws: The logarithmic transformation.
Loet Leydesdorff|Stephen J. Bensman
Journal of the Association for Information Science and Technology (JASIST) 2006 Volume 57 Issue 11
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Co-occurrence matrices and their applications in information science: Extending ACA to the Web environment.
Loet Leydesdorff|Liwen Qiu Vaughan
Journal of the Association for Information Science and Technology (JASIST) 2006 Volume 57 Issue 12
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Can scientific journals be classified in terms of aggregated journal-journal citation relations using the Journal Citation Reports?
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2006 Volume 57 Issue 5

2005

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Mapping the Chinese Science Citation Database in terms of aggregated journal-journal citation relations.
Loet Leydesdorff|Jin Bihui
Journal of the Association for Information Science and Technology (JASIST) 2005 Volume 56 Issue 14
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Similarity measures, author cocitation analysis, and information theory.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2005 Volume 56 Issue 7

2004

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The university-industry knowledge relationship: Analyzing patents and the science base of technologies.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2004 Volume 55 Issue 11

2003

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Rejoinder to Van den Besselaar's letter entitled Descriptive statistics, inferential statistics, rhetorical statistics.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2003 Volume 54 Issue 11
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Empirical evidence of self-organization? A rejoinder.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2003 Volume 54 Issue 8

2002

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Dynamic and evolutionary updates of classificatory schemes in scientific journal structures.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 2002 Volume 53 Issue 12

2001

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The self-organization of the European Information Society: The case of biotechnology.
Loet Leydesdorff|Gaston Heimeriks
Journal of the Association for Information Science and Technology (JASIST) 2001 Volume 52 Issue 13

1997

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Why Words and Co-Words Cannot Map the Development of the Sciences.
Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 1997 Volume 48 Issue 5

1996

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Mapping Change in Scientific Specialties: A Scientometric Reconstruction of the Development of Artificial Intelligence.
Peter van den Besselaar|Loet Leydesdorff
Journal of the Association for Information Science and Technology (JASIST) 1996 Volume 47 Issue 6