caa a22 4500 445348283 CHVBK 20180317142836.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11192-011-0354-5 doi (NATIONALLICENCE)springer-10.1007/s11192-011-0354-5 Towards a new crown indicator: an empirical analysis [Elektronische Daten] [Ludo Waltman, Nees van Eck, Thed van Leeuwen, Martijn Visser, Anthony van Raan] We present an empirical comparison between two normalization mechanisms for citation-based indicators of research performance. These mechanisms aim to normalize citation counts for the field and the year in which a publication was published. One mechanism is applied in the current so-called crown indicator of our institute. The other mechanism is applied in the new crown indicator that our institute is currently exploring. We find that at high aggregation levels, such as at the level of large research institutions or at the level of countries, the differences between the two mechanisms are very small. At lower aggregation levels, such as at the level of research groups or at the level of journals, the differences between the two mechanisms are somewhat larger. We pay special attention to the way in which recent publications are handled. These publications typically have very low citation counts and should therefore be handled with special care. The Author(s), 2011 Bibliometric indicator nationallicence Citation nationallicence Crown indicator nationallicence Field nationallicence Normalization nationallicence Waltman Ludo Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut van Eck Nees Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut van Leeuwen Thed Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut Visser Martijn Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut van Raan Anthony Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut Scientometrics Springer Netherlands 87/3(2011-06-01), 467-481 0138-9130 87:3<467 2011 87 11192 https://doi.org/10.1007/s11192-011-0354-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11192-011-0354-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Waltman Ludo Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut NATIONALLICENCE 700 1- van Eck Nees Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut NATIONALLICENCE 700 1- van Leeuwen Thed Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut NATIONALLICENCE 700 1- Visser Martijn Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut NATIONALLICENCE 700 1- van Raan Anthony Centre for Science and Technology Studies, Leiden University, Leiden, The Netherlands aut NATIONALLICENCE 773 0- Scientometrics Springer Netherlands 87/3(2011-06-01), 467-481 0138-9130 87:3<467 2011 87 11192 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer