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Peer reviewedLoehlin, 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
Loehlin, John C.; Nichols, Robert C. – 1976
This book reports on a study of 850 pairs of twins who were tested to determine the influence of heredity and environment on individual differences in personality, academic ability, and interests. It presents the background, research design, and procedure of the study, tabulations of the test results, and extensive analyses of the findings.…
Descriptors: Academic Ability, Data Analysis, Environmental Influences, Genetics
