Abstract
Possible causes of the heterogeneity of parent-offspring and sibling IQ correlations based on a review of the world literature were investigated. A meta-analysis of the parent-offspring data indicated that sample differences in the size of the IQ correlations were due to sampling error, test unreliability, and differences in the distribution of IQs. A similar analysis of the sibling data failed to reveal the cause of the variability in sibling IQ correlations.
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This research was supported by Grant HD-07176 from the National Institute of Child Health and Human Development. I would like to acknowledge gratefully the invaluable comments and criticisms of Robert Plomin upon early drafts of the manuscript.
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Caruso, D.R. Sample differences in genetics and intelligence data: Sibling and parent-offspring studies. Behav Genet 13, 453–458 (1983). https://doi.org/10.1007/BF01065921
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DOI: https://doi.org/10.1007/BF01065921