title: Cohabitation, convergence, and environmental covariances.
abstract: Temporal variation in traits has long been a central theme in epidemiology. However, human geneticists have largely avoided this topic. Recently, several authors have shown how temporal variation in relative-to-relative covariances can be accommodated within the framework of variance components analysis. The present paper attempts to clarify the mathematics implicit in their approach. A stochastic mechanism is discussed that causes covariances to converge or diverge exponentially fast as relatives cohabit or lead separate lives.
mesh_terms: D004777:Environment; D005826:Genetics, Medical; D006801:Humans; D008433:Mathematics; D008957:Models, Genetic; D010375:Pedigree; D013269:Stochastic Processes; D013997:Time Factors