Beyond Nature versus Nurture: DF Analysis of Nonshared Influences on Problem Behaviors.

Two studies of twin, sibling, and cousin pairs among children attempted to extend a model, called DF analysis, which separates hereditary and shared environmental influences. First study supported the validity of DF analysis applied to kinship height and weight data. The second study showed that spanking, reading, and quality of home environment accounted for variance from nonshared environmental influences. (BC)