Twin Research and Human Genetics · 2005 · 74 citations · 11 references
Life SciencesGeneticsPsychologyBehavioral GeneticsHuman GeneticsPsychometricsComplex Trait GeneticsGene-environment InteractionGenetic CorrelationHeritabilityIntelligence GeneticsTwin StudiesEnvironmental FactorsEnvironmental Variance ComponentsGenetic Correlation In Twin StudiesPhenotypic Correlation AnalysisStructural Equation Modeling In Twin ResearchTwin DesignsTwin Registry StudiesTwin Studies Of Intelligence
Abstract The main aim of this paper was to resolve the correlation between intelligence test scores and standing height into genetic and environmental components. Data on 1181 identical and 1412 fraternal twin pairs (all males) were retrieved by matching files from the Norwegian Army with twin registries. The data were analyzed by means of a structural equation model comprising latent genetic, shared environmental and nonshared environmental factors and correlations between them. A major part of the height–intelligence correlation was due to correlated shared environments (59% of the phenotypic height–intelligence correlation), but statistically significant effects of correlated genes and nonshared environments were also found (respectively 35% and 6% of the phenotypic correlation).
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Massive IQ gains in 14 nations: What IQ tests really measure.
James R. Flynn · Psychological Bulletin · 1987 · 1.8K citations
Predicting zygosity in Norwegian twin pairs born 1915-1960
Per Magnus, K. Berg, W. E. Nance · Clinical Genetics · 2008 · 252 citations