Research Subject Areas have codes, descriptions and are arranged in three levels, 6 at level 1, 42 at level 2, 260 at level 3 (5 digit codes) See https://www.uka.se/statistik--analys/information-om-statistiken/amneslistor-och-huvudomraden/2017-02-14-forskningsamnen.html
research_areas
A data frame with 308 rows and 4 variables:
id
integer subject area code
level
double a level, granularity for code (1..3)
swe
character description in Swedish
eng
character description in English