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A novel version of Snijders's stochastic actor-based modeling (SABM) framework is applied to model the diffusion of first alcohol use through middle school-wide longitudinal networks of early adolescents, aged approximately 11-14 years. Models couple a standard SABM for friendship network evolution with a proportional hazard model for first alcohol use.(More)
This study examined the effects of psychopathological, peer, family, and cultural predictors of American Indian adolescents' drug use following inpatient treatment. Data regarding lifetime, 90 days prior to treatment, and 1-year posttreatment substance use were collected using interviews, questionnaires, and observations of 57 American Indian adolescents(More)
This study examines physical and sedentary activities of early adolescent boys and girls using Ecological Momentary Assessment (EMA), a method that can link mood and behaviors in specific social situations. Twenty-seven assessments were collected across 7 days from 82 participating adolescents, three times in seventh grade and one time in eighth grade.(More)
preseni an empirical exploration oJpeer network mechanisms that encourage nntisocial behavior in early adolescents. We apply SIENA, u network modeling n~eihodology that uddresses developmentully changing, statistically dependent interperronaljriendships. Evidence supports the hypothesis that adolescer~t peer groups play a significant role in the genesis of(More)
The Adolescent Transitions Program is a family-centered intervention strategy designed to reduce problem behavior and prevent drug use within a public school environment. A parent consultant within a Family Resource Center (FRC) provided universal, selected, and indicated interventions that enhanced and supported positive parenting practices known to serve(More)
Close peer networks can affect adolescents' health behaviors by altering their social environments, and thus their risk for and protection against substance use involvement. We tested a 20 minute intervention named Peer Network Counseling that integrates motivational interviewing and peer network strategies with 119 urban adolescents who reported occasional(More)
Settings that that have ecological variables that instill hope might be particularly effective for treating individuals with substance use disorders. More specifically, trust and sense of community could be of importance in the fostering of hope among individuals in recovery from substance use disorders. Our study included a sample of individuals who were(More)
Antisocial behavior typically increases during early adolescence, but the possibility of seasonal variation has not been examined. In this study, trajectories of antisocial behavior were estimated for early adolescent boys and girls. Data were obtained from a 3-year longitudinal study of 11 middle schools in the western U.S. (n = 5,742), with assessments(More)
Adolescent substance use is a developmentally contingent social practice that is constituted within the routine social-environment of adolescents' lives. Few studies have examined peer networks, perceived activity space risk (risk of substance use at routine locations), and substance use. We examined the moderating influence of peer network characteristics(More)
The complex system conception of group social dynamics often involves not only changing individual characteristics, but also changing within-group relationships. Recent advances in stochastic dynamic network modeling allow these interdependencies to be modeled from data. This methodology is discussed within a context of other mathematical and statistical(More)