Blar i Publikasjoner fra Cristin på forfatter "van Leeuwen, Thed"
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Examining national citation impact by comparing developments in a fixed and a dynamic journal set
Schneider, Jesper; van Leeuwen, Thed; Visser, Martijn; Aagaard, Kaare (Journal article; Peer reviewed, 2019)In order to examine potential effects of methodological choices influencing developments in relative citation scores for countries, a fixed journal set comprising of 3232 journals continuously indexed in the Web of Science ... -
Measuring the productivity of national R&D systems: Challenges in cross-national comparisons of R&D input and publication output indicators
Aksnes, Dag W.; Sivertsen, Gunnar; van Leeuwen, Thed; Wendt, Kaja (Journal article; Peer reviewed, 2016)We investigate methodological problems in measuring research productivity at the national level by comparing official R&D statistics from the OECD with publication data from the Web of Science. Data from 18 countries are ...