RESEARCH ARTICLE The ha-index: The average citation h-index Department of Marketing, Innovation, and Organization, Faculty of Economics and Business Administration, Ghent University, Ghent, Belgium Yves Fassin a n o p e n a c c e s s j o u r n a l Keywords: bibliométrie, citation, h-index, indicator, journal ABSTRACT The ranking and categorizations of academic articles of a data set have traditionally

RESEARCH ARTICLE Predicting article quality scores with machine learning: The U.K. Research Excellence Framework Mike Thelwall1 , Kayvan Kousha1 , Paul Wilson1 , Meiko Makita1 , Mahshid Abdoli1 , Emma Stuart1 , Jonathan Levitt1 , Petr Knoth2 , and Matteo Cancellieri2 a n o p e n a c c e s s j o u r n a l 1Statistical Cybermetrics and Research Evaluation

RESEARCH ARTICLE COVID-19 publications in top-ranked public health journals during the first phase of the pandemic Department of Epidemiology & Biostatistics, School of Public Health, Texas A&M University, College Station, TX Dennis M. Gorman a n o p e n a c c e s s j o u r n a l Keywords: COVID-19, peer review, santé publique, research methods, research quality Citation: Gorman,

RESEARCH ARTICLE Open access and international coauthorship: A longitudinal study of the United Arab Emirates research output a n o p e n a c c e s s j o u r n a l 1Faculty of Information Technology and Communication Sciences, Tampere University, Tampere, Finland 2Department of Management and Organisation, Hanken School of Economics, Helsinki, Finland Mohamed Boufarss1 and Mikael Laakso2 Citation: Boufarss,

RESEARCH ARTICLE No deal: German researchers’ publishing and citing behaviors after Big Deal negotiations with Elsevier Nicholas Fraser1 , Anne Hobert2 , Najko Jahn2 , Philipp Mayr3 , and Isabella Peters1,4 1ZBW—Leibniz Information Centre for Economics, Kiel, Germany 2Göttingen State and University Library, University of Göttingen, Göttingen, Germany 3GESIS—Leibniz Institute for the Social Sciences, Cologne, Germany 4Department of Computer Science, Kiel University, Kiel, Germany Keywords:

RESEARCH ARTICLE Is research funding always beneficial? A cross-disciplinary analysis of U.K. research 2014–20 Mike Thelwall1 , Kayvan Kousha1 Cristina I. Font-Julián2 , Mahshid Abdoli1 , Paul Wilson1 , Emma Stuart1 , Meiko Makita1 , , and Jonathan Levitt1 1Statistical Cybermetrics and Research Evaluation Group, University of Wolverhampton, Wolverhampton, UK 2Department of Audiovisual Communication, Documentation and History of Art, Universitat Politècnica de València, València, Espagne

RESEARCH ARTICLE Which factors are associated with Open Access publishing? A Springer Nature case study Fakhri Momeni1 , Stefan Dietze1,2, Philipp Mayr1 , Kristin Biesenbender3 , and Isabella Peters3 1GESIS—Leibniz Institute for the Social Sciences, Cologne, Germany 2Department of Computer Science, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany 3ZBW—Leibniz Information Centre for Economics, Kiel, Germany Keywords: APC policies, bibliométrie, citation impact, machine learning, open access ABSTRACT Open Access

RESEARCH ARTICLE Consistency pays off in science Şirag Erkol1 , Satyaki Sikdar1 , Filippo Radicchi1 , and Santo Fortunato1,2 1Center for Complex Networks and Systems Research, Luddy School of Informatics, Computing, and Engineering, Indiana University Bloomington, Bloomington, IN, USA 2Indiana University Network Science Institute (IUNI), Indiana University Bloomington, Bloomington, IN, USA a n o p e n a c c e s s j o

LETTER Proscription lists and predatory publishers: Pointing to careful certifications Marco Cascella1 , Alessandro De Cassai2 , and Paolo Navalesi3 1Division of Anesthesia and Pain Medicine, Istituto Nazionale Tumori—IRCCS—Fondazione G. Pascale, Naples, Italy 2Unit of Anesthesia and Intensive Care, Padua University Hospital, Padua, Italy 3Department of Medicine, University of Padua, Padua, Italy An article by Macháček and Srholec titled “Predatory publishing in Scopus: evidence on

RESEARCH ARTICLE An open data set of scholars on Twitter Philippe Mongeon1,2 , Timothy D. Bowman3 , and Rodrigo Costas4,5 1School of Information Management, Dalhousie University, Halifax, Nova Scotia, Canada 2Centre interuniversitaire de recherche sur la science et la technologie (CIRST), Université du Québec à Montréal, Montréal, Québec, Canada 3School of Information Sciences, Wayne State University, Detroit, MI, USA 4Centre for Science and Technology Studies

RESEARCH ARTICLE Science and research landscapes across D-8 organization member countries from a historical perspective: The policy context and collective agendas a n o p e n a c c e s s j o u r n a l Javad Hayatdavoudi1 , Wolfgang Kaltenbrunner1 , and Rodrigo Costas1,2 1Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands 2DSI-NRF Centre of Excellence in

RESEARCH ARTICLE Impact of geographic diversity on citation of collaborative research Cian Naik1 , Cassidy R. Sugimoto2 , Vincent Larivière3 , Chenlei Leng4,6 , and Weisi Guo4,5,6 1University of Oxford, Oxford, UK 2Georgia Institute of Technology, Atlanta, GA, USA 3University of Montreal, Montréal, Canada 4University of Warwick, Coventry, UK 5Alan Turing Institute, Londres, UK 6Cranfield University, Cranfield, UK Keywords: air travel, citation, collaborative research, diversity,

RESEARCH ARTICLE Who influences policy labs in the European Union? A social network approach Esteban Romero-Frías1,2 , Daniel Torres-Salinas1,3,4 , and Wenceslao Arroyo-Machado1,3 1Medialab UGR, University of Granada, Granada, Spain 2Department of Accountancy and Finance, University of Granada, Granada, Spain 3Department of Information and Communication Sciences, University of Granada, Granada, Spain 4EC3metrics Spin-off, University of Granada, Granada, Spain Keywords: Union européenne, influencers, policy labs, public

RESEARCH ARTICLE Field-level differences in paper and author characteristics across all fields of science in Web of Science, 2000–2020 a n o p e n a c c e s s j o u r n a l Danish Centre for Studies in Research and Research Policy, Aarhus University, Aarhus, Denmark Jens Peter Andersen Keywords: field definitions, publication analysis, publication characteristics, scientific communication, scientific fields,

RESEARCH ARTICLE The APC-barrier and its effect on stratification in open access publishing Thomas Klebel1 and Tony Ross-Hellauer1,2 1Open and Reproducible Research Group, Know-Center GmbH, Graz, Austria 2Open and Reproducible Research Group, Graz University of Technology, Graz, Austria Keywords: article processing charge, equity, institutional resources, Open Access, stratification ABSTRACT Current implementations of Open Access (OA) publishing frequently involve article processing charges (APCs). Increasing evidence has

RESEARCH ARTICLE The spread of retracted research into policy literature Dmitry Malkov , Ohid Yaqub , and Josh Siepel Science Policy Research Unit (SPRU), University of Sussex, Brighton, UK a n o p e n a c c e s s j o u r n a l Keywords: altmetrics, evidence-based policy, policy-based evidence, research impact, retractions Citation: Malkov, D., Yaqub, O., & Siepel, J..

RESEARCH ARTICLE Are papers published in predatory journals worthless? A geopolitical dimension revealed by content-based analysis of citations a n o p e n a c c e s s j o u r n a l Zehra Taşkın1,2 , Franciszek Krawczyk2 , and Emanuel Kulczycki2 1Department of Information Management, Hacettepe University, Ankara, Turkey 2Scholarly Communication Research Group, Adam Mickiewicz University, Poznań, Poland Citation: Taşkın,

RESEARCH ARTICLE Citation metrics covary with researchers’ assessments of the quality of their works Dag W. Aksnes , Fredrik Niclas Piro , and Lone Wanderås Fossum Nordic Institute for Studies in Innovation, Research, and Education (NIFU), Oslo, Norway a n o p e n a c c e s s j o u r n a l Keywords: bibliometric indicators, citations, metrics, peer review, recherche