chuck (the occidentalist) looks at ron unz’s claim that mexican-american iqs have been increasing (rather dramatically) over the last thirty to forty years:

“The differences [between white and mexican/hispanic iqs] ranges from 0.35 SD (GSS) to 0.77 SD (TIMSS grade 8 science). The average of the differences comes out to 0.61 SD or, when averaging PISA, TIMSS, and PIRLS tests scores per year, per grade (e.g., PISA 2009 MAth + Reading), 0.59 SD. This is not largely different from the general intelligence difference reported by Roth et al. (2001), which is notable given what was said about Spearman’s hypothesis. On re-analysis, Ron Unz’s claim concerning the difference in the GSS sample was upheld; this claim, though, was contradicted by all other samples.

previously: ron unz and iq

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