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Do Assortative Mating Patterns for IQ Block Upward Social Mobility?

Do Assortative Mating Patterns for IQ Block Upward Social Mobility?. Wendy Johnson University of Edinburgh William G. Iacono and Matt McGue University of Minnesota April 19, 2014. Assortative Mating for IQ. Generally runs .3 to .4 Source is most likely educational assortment

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Do Assortative Mating Patterns for IQ Block Upward Social Mobility?

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  1. Do Assortative Mating Patterns for IQ Block Upward Social Mobility? Wendy Johnson University of Edinburgh William G. Iacono and Matt McGue University of Minnesota April 19, 2014

  2. Assortative Mating for IQ • Generally runs .3 to .4 • Source is most likely educational assortment • Rather than IQ directly • Increases genetic variance and population stratification • Generally assumed to be stable across the range of IQ, but what if not? • Interesting social phenomenon in own right • Would especially stratify population where highest

  3. Minnesota Twin Family Study • Longitudinal study of two cohorts of twins • One recruited age 11 (1260 pairs), one age 17 (635 pairs) • Return basically every 3 years • IQ assessed (abbreviated WAIS/WISC) ages 11, 17, 25 in twins, intake in parents • Very population-representative; recruited from population records with ~80% participation, high retention over time

  4. Correlations

  5. Another Correlation • Higher parent’s IQ-absolute value of difference in parents’ IQs: • .515 in 11-yo • .605 in 17-yo • Some examples: • 151-118, 151-110, 147-134, 146-121, 145-121, 145-121, 144-129, 143-100, 143-117, 142-105 • 77-77, 78-78, 78-76, 79-77, 80-74, 81-75, 81-79, 82-76, 83-81, 83-73, 84-72, 84-83, 84-80, 85-72

  6. Why? • Above 100, higher up you are, fewer there are like you • But people with high IQ tend to be successful at what they’re doing and attractive partners to people in the more heavily populated lower parts of the distribution • Low IQs are relatively rare too • But people in these ranges not so attractive to people in more heavily populated parts of the distribution • And less likely to participate in scientific studies

  7. IQ and SES Gibson, J. B. (1973). Journal of Biosocial Science, 5, p. 254, Data from three Cambridge-based studies.

  8. IQ and Earnings Murray, C. (1997). Public Interest, 28, p. 23. Data from NLSY.

  9. Social Mobility? Murray, 1997

  10. More Correlations

  11. Socioeconomic status modifies heritability of IQ in young children Author(s): Turkheimer, E; Haley, A; Waldron, M; et al. Source: PSYCHOLOGICAL SCIENCE  Volume: 14   Issue: 6   Pages: 623-628   DOI: 10.1046/j.0956-7976.2003.psci_1475.x   Published: NOV 2003 Times Cited: 302 (from All Databases)

  12. 100 Generations of Corn Breeding Hill, W. G. (2005). Science, 307, 683 – 684, adapted from Dudley, J. W., & Lambert, R. J. (2004). Plant Breeding Reviews, 24, Part 1, 79.

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