Based on this [page] (https://international.ipums.org/international/geography_variables.shtml) and this paper, the IPUMS constructs GEO2_BR: 1) by harmonizing municipalities across time; 2) by “regionalizing” them to meet the 20,000 inhabitants threshold for confidentiality reasons.
The above page and paper also say that the IPUMS uses as much as possible the documentation provided by the partner statistical agencies (the IBGE in Brazil) to perform 1) and 2).
Since the IBGE has has its own harmonized municipalities, called AMC (“áreas mínimas comparáveis”), I am wondering whether the IPUMS’s GEO2_BR and the IBGE’s AMC only differ due to 2). In other words, if all Brazilian were above the 20,000 inhabitants threshold, would there be any difference between IPUMS’s GEO2_BR and IPUMS’s AMC?
Thanks a lot.