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1,768 12- to 18-year-old boys, in pairs from five constellations (identical and fraternal twins, brothers, unrelated boys raised together and a random general population sample) were measured by the O-A (performance) personality battery on source traits UI 16, 17 and 19. Corrections were made for ages and test validities in computing observed variances.(More)
depression: A test of the specific vulnerability and symptom specificity hypothesis. (2000). Ambulance personnel and critical incidents: Impact of accident and emergency work on mental health and emotional well-being. and pain complaints among firefighters and paramedics. 307 intervention for a metropolitan fire department.Autonomy Scale: A measure of(More)
Cattell, R. B. Theory of fluid and crystallized intelligence: a critical experiment. Journal of Educational Psychology Anderson, T. W. The use of factor analysis in the statistical analysis of multiple time series. Psychometrika Meredith, W. Notes on factorial invariance. Psychometrika Horn, J. L. A rationale and technique for estimating the number of(More)
Tested over 3,000 boys (identical and fraternal twins, ordinary sibs, general population) aged 12-18 on Ego Strength, Super Ego Strength, and Self Sentiment. The Multiple Abstract Variance Analysis (MAVA) method was used to obtain estimates of abstract (hereditary, environmental) variances and covariances that contribute to total variation in the three(More)