PNAD and the importance of household surveys
The most common source for Brazilian information about living standards is the PNAD1. Usually, when some institution says something about poverty, inequality, education, housing, etc. in Brazil, they recur to the amazing publications produced by the Brazilian Institute for Geography and Statistics (IBGE).
But that is how it’s usually done. IBGE also produces amazing microdata, available to everyone. Using it, researchers can focus on specific questions regarding any topic investigated in the survey.