Journal article

GENETIC AND ENVIRONMENTAL VARIATION IN EYSENCK PERSONALITY QUESTIONNAIRE SCALES MEASURED ON AUSTRALIAN ADOLESCENT TWINS

GT MACASKILL, JL HOPPER, V WHITE, DJ HILL

BEHAVIOR GENETICS | PLENUM PUBL CORP | Published : 1994

Abstract

The Eysenck Personality Questionnaire was administered to 1400 Australian twin pairs aged 11 to 18, and the data were analyzed by a multivariate normal model using the software FISHER. For each scale, attempts were made to transform to normality, about a mean modeled separately for each sex as a quadratic function of age. Variances and covariances were estimated for each sex-zygosity group as a monotone function of age. Evidence for genetic sources of variation were assessed in part by fitting models which allowed for age-dependent, sex-specific, and correlated additive genetic factors, and age-dependent and sex-specific environmental factors, under the assumption that effects of environment..

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