ShanghaiRanking has published the world university ranking by academic subjects since 2009 and the GRAS was first published in 2017, which is regarded as one of the most influential and widely observed university rankings. It uses a range of objective academic indicators and third-party data to measure top world universities’ performance in respective subjects, including research output, research influence, international collaboration, research quality, and international academic awards. The GRAS has analyzed the universities that have published a certain number of publications during 2015 – 2019.
The full version of GRAS 2021 and its methodology can be found at here.