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This note's aim is to investigate the sensitivity of Christakis and Fowler's claim [Christakis, N., Fowler, J., 2007. The spread of obesity in a large social network over 32 years. The New England Journal of Medicine 357, 370-379] that obesity has spread through social networks. It is well known in the economics literature that failure to include contextual(More)
This study asks two related questions about the shifting landscape of marriage and reproduction in US society over the course of the last century with respect to a range of health and behavioral phenotypes and their associated genetic architecture: (i) Has assortment on measured genetic factors influencing reproductive and social fitness traits changed over(More)
Mental health problems represent a potentially important but relatively unexplored factor in explaining human capital accumulation during college. We conduct the first study, to our knowledge, of how mental health predicts academic success during college in a random longitudinal sample of students. We find that depression is a significant predictor of lower(More)
In this paper, I use a nationally representative sample of adolescents from the United States to examine the association between childhood mistreatment (sexual abuse and physical abuse) and depression during adolescence and young adulthood. Researchers have implicated childhood mistreatment as one of the most important predictors of depression. An(More)
Research has shown that low birth weight is linked to infant mortality as well as longer term outcomes. This paper examines the medium term outcomes that may link low birth weight to adult disadvantage. Results show strong effects on several educational outcomes, including early grade repetition, receipt of special education services, and diagnosis of a(More)
This paper contributes to the literature on the relationship between adolescent depression and educational attainment in several ways. First, while cross-sectional data are normally used, this paper uses longitudinal data in order to defend against the potential of reverse causality. Second, this is the first paper in the literature to control for(More)
A national sample of US teenagers combined with a complementary sample of US adults are used to examine the effects of teenage childbearing on health behaviors by comparing female siblings in both the teenage sample and a sample of adults. Additionally, miscarriage information available in the teenage sample is used to form comparison groups. Unlike(More)
OBJECTIVE To investigate whether "network effects" can be detected for health outcomes that are unlikely to be subject to network phenomena. DESIGN Statistical analysis common in network studies, such as logistic regression analysis, controlled for own and friend's lagged health status. Analyses controlled for environmental confounders. SETTING(More)
Three inter-related studies examine the construct of problem solving as it relates to the assessment of deficits in higher level outpatients with traumatic brain injury (TBI). Sixty-one persons with TBI and 58 uninjured participants completed measures of problem solving and conceptually related constructs, which included neuropsychological tests,(More)
We develop a key-player model by allowing for link formation so that when a person is removed from a network the other individuals can form new links while still optimally providing crime effort. We then put our model to the test, using data on adolescent delinquents in the United States, and provide new results regarding the identification of peer effects.(More)