Age-adjusted spouse correlations for 15 tests of specific cognitive abilities were relatively small in samples of Americans of Japanese Ancestry (AJA) and Americans of European Ancestry (AEA). Median correlations based upon data from 148 AJA couples and 555 AEA couples were + .07 and + . 13, respectively. When effects of educational attainment were statistically removed, resulting partial correlations became even smaller. These results suggest that there is relatively little assortative mating for specific cognitive abilities, especially for that part of ability which is independent of educational level.
Johnson, R C.; DeFries, J C.; Wilson, J R.; and McClearn, G E.
"Assortative Marriage for Specific Cognitive Abilities in Two Ethnic Group,"
2, Article 8.
Available at: https://digitalcommons.wayne.edu/humbiol/vol48/iss2/8