I updated my biracial difference estimate. I used standard deviation adjusted, Flynn corrected scores. Using the data I then estimated the between group heritability of the B-W gap. This was done by determining the cross sample average deviation from the genetic prediction that biracials will perform halfway between the parental populations and then subtracting this from one. The assumption here is that genetic factors condition consistent intermediate performance while environmental factors tend to make biracial individuals more similar to one or the other of their parental populations, situation depending. The more heterogeneous the scores across samples, the more the environmental influence. Based on this assumption, I estimated a BGH of 0.43; The correlation between age and deviation from a genetic prediction was -0.55, which indicates that older samples tend to conform closer to a genetic prediction than younger ones, which is consistent with a genetic hypothesis. I found a similar phenomena with the NAEP data.
All this means, of course, is that there is one more -ism on its way.