It is certainly true that IQ tests are better at measuring within group differences than between group differences. And I believe that IQ doesn’t predict much success in the US once you control for education. But it does predict longevity when controlling for wealth and education. The IQ literature has a very serious lack of studies comparing the effects of IQ to wealth or education.
It is certainly true that IQ tests are better at measuring within group differences than between group differences. And I believe that IQ doesn’t predict much success in the US once you control for education. But it does predict longevity when controlling for wealth and education. The IQ literature has a very serious lack of studies comparing the effects of IQ to wealth or education.