Via The Audacious Epigone: IQ scores by US ethnic groups. It is not very useful I think in theoretical or practical applications but it is interesting as a showcase of why IQ is more than just genetic inheritance, incorporating also Flynn, sampling issues, sense of popular identity, selection bias, etc.
Wordsum is basically a vocab test of 10 words (example). While one might not expect such a quick and simple test to accurately reflect IQ it actually does – the correlation between Wordsum scores and IQ is about 0.71. Respondents got to choose the one or two ethnic groups to which they belong. (See table below)
By and large, the results are as we would expect:
(1) Many of the Russians (about 50%) are, of course, Ashkenazi Jews. Explained.
(2) At first puzzling is the fact that Germans score considerably below the Irish, Mediterraneans (Italians, Greeks, French) and Slavics (Poles, Czechs). This is an inversion of European PISA results in which native Germans got 105 compared to France’s 101, Poland’s 100, Italy’s 98, Greece’s 96, etc. There are two reasons for this I think: