Updated (and edited)

[edited]
I updated my Biracial Black-White, Pisa 2009 post. The following was added:

[Update: I repeated my previous analysis using Pisa 2006 Science data (age 15) and using International Explorer. In that data — screen shot here — there were 72 self identified mixed race students. The following averages were found: (non-hispanic) White 522, (non-hispanic) Mixed White-Black 470, (non-hispanic) Black 408.]

[Update: I repeated my previous analysis using Pisa 2006 Math data (age 15) and using International Explorer. In that data — screen shot here — there were 67 self identified mixed race students. The following averages were found: (non-hispanic) White 502, (non-hispanic) Mixed White-Black 464, (non-hispanic) Black 403.]

Since, I have found the self-report multiracial status does not correspond well with school reported status, at least at young ages (e.g., NAEP 4th grade). This calls into question the significance of the findings in context of reducing the hereditarian/environmental uncertainty. The findings are nonetheless interesting and important in their own right, since, as noted in discussion with JL, they can’t be explained purely in terms of sampling. Identification as mixed race is associated with intermediate scores. Further investigation could uncover strong support for a cultural (i.e., being-X and acting Y) or hereditarian (i.e., being 1/2 X and 1/2 Y) hypothesis.

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