Here is how they compute their rankings, which are based on the Thomson-Reuters (formerly ISI) databases.
- 25% to research productivity (number of articles over the last 11 years, number of articles in the current year),
- 35% to research impact (number of citations over the last 11 years, number of citations in the current year, average number of citations over the last 11 years)
- 40% to research excellence (h-index over the last 2 years, number of highly cited papers, number of articles in the current year in highly cited journals).
Some of the measures seem to be *absolute* numbers, like the total number of articles over the last 11 years, and not relative numbers. This favours larger universities. Also, arts and humanities are not counted.
I looked up the Irish universities.
235 Trinity College Dublin
277 University College Dublin
311 Queen’s University Belfast
398 University College Cork
No others in top 500.
I find it interesting that University of London, Royal Holloway comes outside the top 500, and on the other hand is number 11 in the world for research impact according to the THE world rankings. Why is there such a big difference?