Over the last decade a number of authors, including ourselves, have attempted to
understand human cultural variation using Darwinian methods. This work is unified by the …

Systolic (SBP) and diastolic (DBP) blood pressures were measured in a health screening of
the adult population in Nord‐Trøndelag, Norway. Correlations were computed for 23,936 …

An accurate specification of the dimensionality and ordering of categorical multifactorial
phenotypes (eg, smoking status, including heavy, moderate, light, and nonsmokers) is an …

This paper presents an elementary statistical method for analyzing dichotomous outcomes
in unselected samples of twin pairs using stratified estimators of the odds ratio. The …

An important assumption underlying the twin method of comparing NIZ and DZ twins is that
results from twin samples can be generalized to the larger singleton population. This study …

Parameters of quantitative genetic models have traditionally been estimated by either
algebraic manipulation of familial correlations (or familial mean squares), biometric model …

Our analyses of Carey's (1992) simulated data set of substance abuse in a cohort of
adolescent twins were aimed at answering the question What is the relationship between …

Seasonal changes in mood and behavior (seasonality) have been reported to occur in the
general population. Seasonal Affective Disorder (SAD), a clinically diagnosed syndrome, is …

Recent theoretical work on the processes of cultural evolution helps to provide a clearer
picture of the relationship between genetic and cultural influences on human behavior. The …

The present study was designed to investigate whether the personalities of adult children of
alcoholics differ in some way from individuals who do not have an alcoholic parent. Women …