The centres of this ranking are chosen depending on the number of publications indexed at the Web of Science in the 2013-2016 periods. The universities of Harvard and Toronto lead the ranking globally. The University of Oxford, the College of London and the University of Cambridge lead the ranking in Europe. CWTS Leiden uses joint databases that offer statistics on the scientific impact of the universities and their participation in scientific collaboration.

The classification includes a complete count that gives the same importance to all the publications of a university, and another fractioned, in which the collaborative publications are weighted depending on the number of participants. Thus, in this second count the Universitat de València is placed on the 5th, 84th and 253th positions in Spain, Europe and the world, respectively. 

It is the first Valencian University. In Spain, it is only surpassed by the University of Barcelona, the Complutense de Madrid and the Autónoma de Barcelona. In addition, the Valencian Academic Institution ranks the 86th within European universities. 

By areas of knowledge and scientific impact, the Universitat de València is the second best in Social Sciences and Humanities in Spain, the fourth in Biomedicine and Health Sciences, the sixth in Earth Sciences and the seventh in Physics and Engineering. In terms of collaborative research, this ranking places the Universitat de València as the third Spanish university in Social Sciences and Humanities, the fourth in Physics and Engineering and the fifth in biomedicine, Health Sciences and Earth Sciences. 

The classification CWTS Leiden is exclusively based in the data of Web of Science, which is a bibliographical database produced by Thomson Reuters that uses data of the Science Citation Index Expanded, the Social Sciences Citation Index and the Arts & Humanities Citation Index. This ranking does not take into account the publication of books, proceedings of conferences and indexed magazines that are not listed in Web of Science. It only considers essays and revisions of publications in international scientific magazines.

More information (Analysis and Programming Service): http://ir.uv.es/paw2lJU

CWTS Leiden Ranking: http://www.leidenranking.com/ranking/2018/list