Ethnicity and IQ heterogeneity: I was curious about IQ diversity among American ethnic groups. Selecting GSS groups with at least 100 respondents, I calculated the coefficient of variation, a normalized measure of dispersion, for Wordsum scores. Here are the numbers:
Coefficient of variation
Puerto Rican .491
Racially mixed groups are the most IQ-diverse, and Scandinavians and Jews are the most homogeneous (many of those Russians are Jews).
With Mexican Americans especially, we should avoid talking about them like they are a monolithic group.
Authors of a paper published earlier this year in Behavior Genetics have made arguments similar to those of HBD writers Greg Cochran and...
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Via a reader at iSteve, it looks like this might be the vocabulary test used by the General Social Survey. (Someone please tell me if I'...