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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
Emde, Robert N., Ed.; Hewitt, John K., Ed. – 2001
This book analyzes the MacArthur Longitudinal Twin Study, a collaborative study by leading developmental scientists and behavioral geneticists on the transition from infancy to early childhood. Part 1 of the book describes the twin method and procedures used and introduces the analytic strategies. Parts 2 through 4 present results related to…
Descriptors: Behavior Problems, Child Development, Cognitive Development, Developmental Stages
