The Centre for Science and Technology Studies (CWTS) at Leiden University in Holland publishes Leiden Ranking. The ranking includes the 500 universities worldwide with the largest publication output in the Web of Science database.
The Leiden Ranking list measures research publication, research impact and collaboration.
The rankings are based on eight indicators divided into three groups:
- Number of publications (P) - measured in terms of full count (equal weight for all publications) and fractional count (less weight for publications made in collaboration with others).
- Average number of citations per publication (MCS)
- Average number of citations per publication normalized for field differences, publication year and document type (MNCS)
- Number of publication in the top 10% of the most frequently cited publications (PP10%)
- Number of publications in collaboration the other organizations (PPcollab)
- Number of publications in collaboration with other countries (PPintcollab)
- The average geographical collaboration distance of the publications of a university, where the geographical collaboration distance of a publication equals the largest geographical distance between two addresses mentioned in the publication’s address list (MGCD)
- The proportion of the publications of a university that have a geographical collaboration distance of more than 1000 km. (PP>1000 km.)
At present, Aalborg University does not hold a place at the Leiden Ranking.
The ranking list was first published in 2008. The bibliometric data is extracted from Web of Science (Thomson Reuters). It includes publications over a four year period, and the publications are of the type article and review exclusively. A place in the latest rankings required 3300 publications over a four year period. Aalborg University had approximately 2400 publications.