LISREL modeling: Genetic and environmental influences on IQ revisited

doi:10.1016/0160-2896(90)90011-H

Intelligence

Volume 14, Issue 1, January–March 1990, Pages 11-29

https://doi.org/10.1016/0160-2896(90)90011-H Get rights and content

Abstract

This article reports a model-fitting analysis of the covariance structure of the world's IQ data as reviewed by Bouchard and McGue (1981). A model is used which includes additive and nonadditive genetic parameters, and shared and nonshared environment parameters that permit different estimates for different types of relatives. The opportunity is taken here to explicate the use of LISREL for such purposes. The results indicate that, when assortative mating is included in the model, nonadditive, as well as additive genetic variance, is important for IQ. Broad heritability is estimated to be .51. Another interesting result is that the influence of shared environment differs in a reasonable way for different types of relatives: twins > siblings > parents and their offspring > cousins.

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Citation Excerpt :
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^∗: The authors thank Dr. John Loehlin for his helpful comments and especially for the novel approach concerning assortative mating.

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LISREL modeling: Genetic and environmental influences on IQ revisited

Abstract

Personality and Individual Differences

Intelligence

Familial studies of intelligence: A review

Science

Genetics and intelligence: A review

Science

Nature and nurture: Heredity

Testing structural equation models for twin data using LISREL

Behavior Genetics

Genetic and behavioral effects of nonrandom mating