The main problem in this dataset is the functional category problem. The
functional category problem means the vertical distribution variation in public sector
employment across countries. For example, in most federal countries, important
education, health, police and administrative responsibilities are delegated to the
subnational government level. It is meaningless simply to compare the number of central
government employees across countries without taking into account that the central
government in one country may perform many of the functions that in another country are performed at the subnational government level.