I was strolling through Cary Town Center the other day when I noticed a Black and White couple with a rather light, but clearly mixed race kid standing line at Auntie Anne’s. On seeing this sight, three thoughts simultaneously crossed my mind: Cary isn’t all that White anymore, How much of the IQ-color correlation is driven by the higher scores of non ‘intergenerational’ Blacks, and Those soft pretzels look pretty good. On returning home, I was able to investigate my IQ question. Defining “multigenerational Black” as all people in Wave III of the ADDhealth study who indicated that they were Black (variable H3OD4B) but not White and defining “Mixed Black/White” as all people in Wave III who indicated that they were Black and who additionally indicated that they were White (variable H3OD4A), I looked at the independent correlations within both groups.
As can be seen, mixed-race Blacks, in this sample, have an extraordinarily high IQ, relative to what one might expect — for comparison, the White Wave I & III mean is 105 & 103 (SD ~12 & 12) — but excluding them does not reduce the ‘intergenerational’ Black IQ-color correlation to non-significance.