“Our conclusion, that the Black–White IQ difference is partly heritable, ac- cords with previous analytic reviews of this literature. Loehlin et al. (1975) concluded that Black–White IQ differences “probably” reflected “genetic differ- ences among the groups” (p. 238).” https://www1.udel.edu/educ/gottfredson/30years/Rushton-Jensen30years.pdf
THIRTY YEARS OF RESEARCH ON RACE DIFFERENCES IN COGNITIVE ABILITY
J. Philippe Rushton Arthur R. Jensen
The University of Western Ontario University of California, Berkeley
I'm not necessarily dismissing the psychometric literature on race and intelligence. In any case I don’t have the mathematical or technical background to rigorously evaluate it, so like many I mostly take my cues from the likes of Charles Murray on these matters.
My point was more that if the strong hereditarian thesis is going to be presented as gospel, there are some empirical oddities in need of clarification. In particular, the superior performance of African immigrants relative to that of Black Americans deserves an explanation given that psychometrics suggests that the former possess an average IQ 1 SD lower relative to that of the latter.
Most people will reflexively explain this as the result of self-selection from Africa’s much larger population, but as I argued above, when you actually crunch the numbers the picture isn’t nearly as clear. Based on accepted group IQ data, we would actually expect slightly more Black Americans in absolute terms above an IQ of 130 relative to number of people with IQs 130+ across the entire continent of Africa. To anyone who's lamented the lagging performance of native born Blacks relative to their African immigrant counterparts, the prior conclusion would probably be surprising.
Based on SAT data, I'd say that IQ 130 is roughly the threshold for the average student at an elite high school like Stuyvesant or a lower tier Ivy League university, hence why I picked it for this discussion.
Thanks; btw don’t trust entrance criteria at schools because a lot let legacies in no matter how stupid they are and many don’t use SAT’s anymore because they could hit their Affirmative Action quotas (because their were not enough minorities testing high enough).
“Our conclusion, that the Black–White IQ difference is partly heritable, ac- cords with previous analytic reviews of this literature. Loehlin et al. (1975) concluded that Black–White IQ differences “probably” reflected “genetic differ- ences among the groups” (p. 238).” https://www1.udel.edu/educ/gottfredson/30years/Rushton-Jensen30years.pdf
THIRTY YEARS OF RESEARCH ON RACE DIFFERENCES IN COGNITIVE ABILITY
J. Philippe Rushton Arthur R. Jensen
The University of Western Ontario University of California, Berkeley
I'm not necessarily dismissing the psychometric literature on race and intelligence. In any case I don’t have the mathematical or technical background to rigorously evaluate it, so like many I mostly take my cues from the likes of Charles Murray on these matters.
My point was more that if the strong hereditarian thesis is going to be presented as gospel, there are some empirical oddities in need of clarification. In particular, the superior performance of African immigrants relative to that of Black Americans deserves an explanation given that psychometrics suggests that the former possess an average IQ 1 SD lower relative to that of the latter.
Most people will reflexively explain this as the result of self-selection from Africa’s much larger population, but as I argued above, when you actually crunch the numbers the picture isn’t nearly as clear. Based on accepted group IQ data, we would actually expect slightly more Black Americans in absolute terms above an IQ of 130 relative to number of people with IQs 130+ across the entire continent of Africa. To anyone who's lamented the lagging performance of native born Blacks relative to their African immigrant counterparts, the prior conclusion would probably be surprising.
Based on SAT data, I'd say that IQ 130 is roughly the threshold for the average student at an elite high school like Stuyvesant or a lower tier Ivy League university, hence why I picked it for this discussion.
Thanks; btw don’t trust entrance criteria at schools because a lot let legacies in no matter how stupid they are and many don’t use SAT’s anymore because they could hit their Affirmative Action quotas (because their were not enough minorities testing high enough).