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
Mexican .415
Black .381
Amerindian .359
Spain .338
Dutch .315
Polish .312
French .307
German .306
Italian .304
Irish .302
Scottish .294
English/Welsh .289
Czech .281
Swedish .280
Norwegian .280
Danish .270
Russian .264
Jewish .239
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.
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Is it just me, or do the ones with higher means tend to have less variation?
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