I'm extracting this from the Greenland thread:
Quote:
Originally Posted by Yuri
There were some undercounting due fakenews (it was Bolsonaro era and they loved to spread all kinds of conspiracy), but not in Amapá, rural areas, smaller cities. Data there was collected quickly. There was indeed a reversal on migratory flux: lots of people from North moved to the three Southern states, something unimaginable till 15 years ago. Southern Brazil usually provided migrants for the farming frontier in Mid-West.
Undercounting was heavily centered on the big metro areas (hence several came negative: Belém, Recife, Salvador, Rio de Janeiro, Porto Alegre and others mostly flat: Fortaleza, Belo Horizonte).
They counted 203,080,756 people in Brazil in 2022. In Brazil, emigrants and immigrants usually cancel each other. Using natural growth as a parameter, some 5 million people is "missing". The most likely number for 2022 it would be 207-208 million.
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Brazil's census, like all censuses, undercounts people. This happens more and more in our mobile society, and this was particularly the case for the 2022 Brazil census that took place during Covid.
That's why several countries have now stopped conducting a full (100%) census every 5/7/10 years, and instead conduct a partial (5%/10%/40%) census every year. France led the way in this (due to the undercounts of its last full census in 1999), and now various other Western countries are following French lead (Spain and Italy also now conduct yearly censuses, various smaller European countries, Netherlands and Nordics don't have full censuses anymore, US too has started a yearly census, called ACS, but due to Constitutional requirements they still have to conduct a full census every 10 years).
Maybe eventually Brazil will switch to a yearly census based only on a sample of the population. These yearly censuses actually count the total population better, because the national statistical institute can count and study more in depth the sample of the population selected. In the French case, 40% of the population is sampled over a 5-year period (8% every year), and in small municipalities 100% of the population is sampled every 5 years.
Anyway, due to the undercounts, IBGE (Brazil's federal statistical office) has had to "redress" the figures after each census. The redressing in 2022 was pretty large (more than 3%). A good census is considered to have a margin of error of only 0.5%, so more than 3% is pretty large.
They have published their redressed figures, and this changes quite a bit the vision of Brazil's population growth.
These are the raw (unredressed) census figures:
- 2010 census: 190,755,799
- 2022 census: 203,080,756
2010-2022 growth: +6.5% (i.e. +0.52%)
And these are the redressed figures, i.e. the real population of Brazil at each census:
- 2010 census: 194,749,329
- 2022 census: 210,862,983
2010-2022 growth: +8.3% (i.e. +0.66%)
So the population growth of Brazil between 2010 and 2022 has been higher than initially thought.
For comparison, 2000-2010 growth based on redressed figures: +11.5% (i.e. +1.09% per year)
Regarding Amapa, it was massively undercounted contrary to what Yuri says. The 2022 census counted 733,759 people in Amapa, but the actual figure (redressed by IBGE) was 795,457. So here the margin of error was more than 8%, i.e. considerably more than at the national level.
Redressed figures are unfortunately not published at the municipal level (as far as I know), so it's impossible to give the population of the Brazilian metro areas with the redressed figures, but it's important to keep in mind that all the population figures of the Brazilian metro areas underestimate their real population. For Rio de Janeiro for instance, 16,055,174 people were counted in the State of Rio de Janeiro at the 2022 census, but the actual (redressed) figure of that state was in fact 17,211,760. So that means the actual population of the Rio de Janeiro metro area should be around 1 million more than published by IBGE. So around 12.8 million instead of 11.8 million (raw data).
Quote:
Originally Posted by Yuri
Regarding births, you're wrong: hospitals report births immediately (SUS) and these data is easily crossed with birth certificates and the Statistical Offices use the combination of those sources and release a year after to garantee all births are there. Births registered on later years represent something like 0.5% those days, and mostly due births on December. We're not in the 1980's anymore.
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Check the IBGE website. A lot of births officially registered between 2010 and 2022 are actually births that took place before 2010. This would be particularly the case in a frontier state like Amapa. So it's impossible to know the actual natural change of Amapa, and therefore deduct its net migration.