-
Article
Detection of the effects of asymmetric assortative mating
Assortative mating is clearly important in determining the genetic structure of a population but studies of assortative mating in man have been restricted mainly to the examination of correlations between spou...
-
Article
A note on the generalized effects of assortative mating
Several twin studies of multiple abilities and educational and socioeconomic variables suggest that a single common factor underlies the contribution of mate selection and cultural inheritance to the covariati...
-
Article
Resolving the effects of phenotype and social background on mate selection
Traditional studies of mate selection have not addressed the question of how a marital correlation arises. The common assumption that assortative mating is based on phenotype has not been properly tested. Soci...
-
Article
Education policy and the heritability of educational attainment
Many workers assume that genetically determined differences in intellectual ability1–5 will be influenced little by changes in educational policy or other environmental interventions6,7. Others8,9, however, have ...
-
Article
No decline in assortative mating for educational level
Education data from the Norwegian twin panel reveal no decline in the marital correlation for educational attainment for the past 35 years. Comparable marital correlations are found for British and American sa...
-
Article
The resolution of cultural and biological inheritance: Informativeness of different relationships
The informativeness of different relationships for resolving the genetic and cultural transmission of a continuous variable is explored by computer simulation. Extended twin, extended nuclear-family, and adopt...
-
Article
A theory of developmental change in quantitative phenotypes applied to cognitive development
A model is presented for the changes in familial resemblance as a function of age. The model allows for separate developmental components of genetic and environmental effects and for the influence of earlier p...
-
Article
Social inequality and assortative mating: Cause or consequence?
Johnsonet al. (Behav. Genet. 17:1–7, 1987) have interpreted an apparent decline in assortative mating for educational attainment in Hawaii as being a consequence of increased social mobility and increased access ...
-
Article
Testing genetic models for multiple symptoms: An application to the genetic analysis of liability to depression
A model is presented which allows for the contribution of genes and environment to categorical data on multiple symptoms. The model distinguishes between parameters needed to express the relationship between a...
-
Article
Genetic and environmental factors in primary dysmenorrhea and its relationship to anxiety, depression, and neuroticism
Over 1200 pairs of female monozygotic and dizygotic twins with regular menses reported on the amount of flow, severity of pain, and degree of limitation experienced during menstruation. Fifty-two percent of th...
-
Article
A note on computing the chi-square noncentrality parameter for power analyses
Power calculations for a variety of research designs used in behavior genetics require the determination of a chi-square noncentrality parameter. For many purposes published tables are adequate, but for cases ...
-
Article
The effects of social homogamy and cultural inheritance on the covariances of twins and their parents: A LISREL model
In general, models involving parent-offspring transmission are not possible to specify in LISREL due to the complex constraints implied by assortative mating and genotype-environmental correlation. In this sho...
-
Article
Fitting genetic models with LISREL: Hypothesis testing
A brief introduction to the mathematical theory involved in model fitting is provided. The properties of maximum-likelihood estimates are described, and their advantages in fitting structural models are given....
-
Article
Testing structural equation models for twin data using LISREL
Simple genetic models can be fitted to twin data using software packages such as LISREL (Jöreskog and Sörbom, 1986a). After discussion of data preparation and routine checks on possible violation of assumption...
-
Article
Religious affiliation in twins and their parents: Testing a model of cultural inheritance
The transmission of religious affiliation is analyzed in a sample of 3810 Australian twin pairs and their parents. Twins were classified by sex, zygosity, and whether they were living together or apart. Analys...
-
Article
Personality and reproductive fitness
The relationship between reproductive success (number of biological children) and personality was explored in 1101 postmenopausal females from the Australian twin registry. The quadratic response surface relat...
-
Article
Religion and education as mediators of attitudes: A multivariate analysis
The transmission of social attitudes has been investigated as a possible model of cultural inheritance in a sample of 3810 twin pairs from the Australian National Health and Medical Research Twin Registry. Six...
-
Article
Testing hypotheses about direction of causation using cross-sectional family data
We review the conditions under which cross-sectional family data (e.g., data on twin pairs or adoptees and their adoptive and biological relatives) are informative about direction of causation. When two correl...
-
Article
A model system for analysis of family resemblance in extended kinships of twins
The “Virginia 30,000” comprise 29,698 subjects from the extended kinships of 5670 twin pairs. Over 80 unique correlations between relatives can be derived from these kinships, comprised of monozygotic (MZ) and...
-
Article
Logistic regression analysis of twin data: Estimation of parameters of the multifactorial liability-threshold model
We extend the DeFries-Fulker regression model for the analysis of quantitative twin data to cover binary traits and genetic dominance. In the proposed logistic regression model, the cotwin's trait status,C, is th...
