|Published by||Selection Criteria|
Centre for Science and Technology Studies, Universität Leiden
|Top 500 universities based on Leiden indicators|
|Data Basis & Methodology||Indicators|
|Thomson Reuters database, Web of Science (WoS)
- Only natural and social sciences. Arts and humanities are excluded for methodological reasons
- Only the following publication types are considered: articles, letters and reviews
Information on methodology
The methodology and data used in the Leiden Ranking are very transparent, and the inconclusive nature of the final results is clearly indicated (see data basis). And, because the methodology changes from year to year, the editors discourage a longterm comparison of results.
A unique factor of the Leiden Ranking is the current possibility of excluding non-English language articles when interpreting the data. This is because such publications necessarily have a smaller readership and are consequently less likely to be cited, leading to statistically irrelevant results.
A problematic point concerns treating geographical aspects when assessing joint research projects. Here it must be noted that Australian universities occupy the top ranks en bloc. The question arises as to whether the high ranking is a sign of excellence in research and research collaboration, or rather the fact that Australian universities are traditionally linked to other Commonwealth countries, and that the geographical distances between Australia and most other countries in the Commonwealth are quite large.