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Loehlin, John C. – Multivariate Behavioral Research, 1987
Scores were obtained on 31 item-clusters from the California Psychological Inventory for 490 identical and 317 same-sex fraternal twin pairs from the National Merit twin sample. Ordinary and cross-pair correlations were calculated and used to derive three matrices hypothesized to reflect the influence of genes, shared environment, and unshared…
Descriptors: Correlation, Environmental Influences, Factor Analysis, Heredity