The identification and validation of distinct depressive syndromes in a population-based sample of female twins. The independence of physical attractiveness and symptoms of depression in a female twin population. Temperance board registration for alcohol abuse in a national sample of swedish male twins born 1902-1949. Predictors of problem drinking and alcohol dependence in a population-based sample of female twins. The use of likelihood-based confidence intervals in genetic models.
Age changes in the causes of individual differences in conservatism.
A quantitative genetics perspective.