The PIAAC – Programme for the International Assessment of Adult Competencies, also called the PISA for adults, is an international survey assessing the cognitive abilities and skills of the adult populations of western countries (and several other countries too). It includes a reading comprehension assessment, a math ability assessment, and an assessment for problem solving in computer environments.
The PIAAC samples are nationally representative, with 5000-10000 people per country and include data from total of 215 000 respondents.
The tests have similarities with those from PISA, which are highly correlated with IQ. The testing was done in 2012-2013 and things could have gotten worse since then.
The tests predict IQ of 85 for US blacks, 90 for US hispanics, and 101 for US whites, which is broadly consistent with most research on this issue, as well as US SAT scores.
I decided to use math ability as a proxy of IQ (for example math tests on the SAT, AFQT and the WAIS are highly G loaded). Using literacy is more problematic, as it is possible that the immigrants did not yet learn the language very well, regardless of their IQ. With math things should be more accurate.
Assuming that the IQ of the native born population in most western countries is 100, and in the US is 98, with an SD of 52 (this is the SD for the total countries sample, there are relatively small differences between the different countries), these are the things that i found:
Western Europe gets the worst migrants; the US gets bad migrants too; Canada – somewhat better. Australia is better too, but their migrants still perform worse than the native population. New Zealand gets the best migrants, only slightly worse than the native population. As far as i know Australia and New Zealand import lots of white, Chinese, or rich migrants (high earnings are correlated with IQ), so that higher migrant IQ makes sense. Of all countries, Sweden and Scandinavian countries in general get the worst migrants.
100 native IQ assumed for most countries
IQ of migrants in Western countries:
New Zealand 99,1
Italy 95 (note that this is before the current migrant crisis, for 2012-2013)
Ireland 94 (based on native IQ 94)
England (UK) 92
Spain 90,8 (based on native IQ 97)
Belgium (Flanders) 90,1
USA 89 (based on native IQ 98)
Western Europe 89
As you can see, Sweden got the worst deal. Not surprisingly, the IQ of the country is dropping, although they blamed TV and tablets for that.
Another interesting thing to emerge from the data is that Japan has the highest IQ of all developed countries (based on math ability + reading comprehension, which is highly correlated with IQ). Maybe 4-5 IQ points above the average of Western Countries. But the most interesting thing is that the Japanese have lower variability than westerners, which could lead to westerners ultimately having more geniuses per capita than the Japanese, which could explain the dominance of westerners among Nobel Laureates and revolutionary scientific breakthroughs. I saw that theory discussed (and refuted) several times in the past, and this is the first time where I have seen that the actual data backs up this theory. So this finding is big and i haven’t seen anyone mention it up to now.
Another important thing is evidence that IQ in various western countries is dropping. For example math ability in the general population of the US, Canada, Norway, and the Netherlands declined compared to 2003-2008.