Plus, the measurement is based on journal articles from commercial databases (eg: Scopus). Those databases index have language bias. On the other hand, we are lacking of national level scientific database that provide dataset for those rankings to process.
All rankings measure the following components, which all of them contain level of bias:
- Teaching (the learning environment): international students vs large amount of internal high school graduates
- Research (volume, income and reputation): high profile research vs "low level" research to solve internal national problem
- Citations (research influence): only based on commercial database with language bias
- International outlook (staff, students and research): lack of national data (eg: tracer study) to share with those ranking, international vs national issues
- Industry income (knowledge transfer): this is mostly controlled by economical situation, which the universities have no control.