995 citations · 2.4k across the 265 of their papers we have counts for
11 papers · 2 filters
The relative influences of government funding and international collaboration on citation impact
Loet Leydesdorff, Lutz Bornmann, Caroline S. Wagner
In a recent publication in Nature, Wagner & Jonkers (2017) report that public R&D funding is only weakly correlated with the citation impact of a nation's papers as measured by the…
Automated Analysis of Topic-Actor Networks on Twitter: New approach to the analysis of socio-semantic networks
Iina Hellsten, Loet Leydesdorff
Social-media data provides increasing opportunities for automated analysis of large sets of textual documents. So far, automated tools have been developed to account for either the…
Patent Citation Spectroscopy (PCS): Algorithmic retrieval of landmark patents
Jordan A Comins, Stephanie A Carmack, Loet Leydesdorff
One essential component in the construction of patent landscapes in biomedical research and development (R&D) is identifying the most seminal patents. Hitherto, the identification…
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
The Leiden Rankings can be used for grouping research universities by considering universities which are not statistically significantly different as homogeneous sets. The groups a…
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-Gomez +2
Using information theory, we measure innovation systemness as synergy among size-classes, zip-codes, and technological classes (NACE-codes) for 8.5 million American companies. The…
The geography of references in elite articles: What countries contribute to the archives of knowledge
Lutz Bornmann, Caroline Wagner, Loet Leydesdorff
This study is intended to find an answer for the question on which national "shoulders" the worldwide top-level research stands. Traditionally, national scientific standings are ev…
Reference Publication Year Spectroscopy (RPYS) of Eugene Garfield's publications
Lutz Bornmann, Robin Haunschild, Loet Leydesdorff
Which studies, theories, and ideas have influenced Eugene Garfield's scientific work? Recently, the method reference publication year spectroscopy (RPYS) has been introduced, which…
Probing Multivariate Indicators for Academic Evaluation
Helen F. Xue, Loet Leydesdorff, Fred Y. Ye
We combine the Integrated Impact Indicator (I3) and the h-index into the I3-type framework and introduce the publication vector X = (X1, X2, X3) and the citation vector Y = (Y1, Y2…
Betweenness and Diversity in Journal Citation Networks as Measures of Interdisciplinarity -- A Tribute to Eugene Garfield --
Loet Leydesdorff, Caroline S. Wagner, Lutz Bornmann
Journals were central to Eugene Garfield's research interests. Among other things, journals are considered as units of analysis for bibliographic databases such as the Web of Scien…
Mapping Patent Classifications: Portfolio and Statistical Analysis, and the Comparison of Strengths and Weaknesses
Loet Leydesdorff, Dieter Franz Kogler, Bowen Yan
The Cooperative Patent Classifications (CPC) jointly developed by the European and US Patent Offices provide a new basis for mapping and portfolio analysis. This update provides an…
Toward a Calculus of Redundancy: The feedback arrow of expectations in knowledge-based systems
Loet Leydesdorff, Mark W. Johnson, Inga Ivanova
This paper considers the relationships among meaning generation, selection, and the dynamics of discourse from a variety of perspectives ranging from information theory and biology…