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Published online by Cambridge University Press: 01 September 2008
Unquestionably, aggregate-level correlations are in most cases higher than individual-level correlations. For example, in the National Longitudinal Survey of Youth (NLSY) in the United States, the correlations are 0·487 between adolescent IQ and log-transformed adult income, 0·449 between years of schooling and adult income and 0·626 between years of schooling and IQ (N=6064). The corresponding country-level correlations are 0·815, 0·816 and 0·788 (N=125 countries).