This study addresses not only influence and selection of friends as sources of similarity in alcohol use, but also peer processes leading drinkers to be chosen as friends more often than non-drinkers, which increases the number of adolescents subject to their influence. Analyses apply a stochastic actor-based model to friendship networks assessed five times from 6th through 9th grades for 50 grade cohort networks in Iowa and Pennsylvania, which include 13,214 individuals. Results show definite influence and selection for similarity in alcohol use, as well as reciprocal influences between drinking and frequently being chosen as a friend. These findings suggest that adolescents view alcohol use as an attractive, high status activity and that friendships expose adolescents to opportunities for drinking.

Objectives We test the hypothesis that an evidence-based preventive intervention will change adolescent friendship networks to reduce the potential for peer influence toward antisocial behavior. Altering adolescents’ friendship networks in this way is a promising avenue for achieving setting-level prevention benefits such as expanding the reach and durability of program effects. Methods Beginning in 2002, the PROSPER randomized control trial assigned two entire 6th grade cohorts of 14 rural and small town school districts in Iowa and Pennsylvania to receive the intervention and of 14 to control. A family-based intervention was offered in 6th grade and a school-based intervention was provided in 7th grade. Over 11,000 respondents provided five waves of data on friendship networks, attitudes, and behavior in 6th-9th grade. Antisocial influence potential was measured by the association between network centrality and problem behavior for each of 256 networks (time, grade cohort, and school specific). Results The intervention had a beneficial impact on antisocial influence potential of adolescents’ friendship networks, with p < .05 for both of the primary composite measures. Conclusions Current evidence-based preventive interventions can alter adolescents’ friendship networks in ways that reduce the potential for peer influence toward antisocial behavior.

Seeking to reduce problematic peer influence is a prominent theme of programs to prevent adolescent problem behavior. To support the refinement of this aspect of prevention programming, we examined peer influence and selection processes for three problem behaviors (delinquency, alcohol use, and smoking). We assessed not only the overall strengths of these peer processes, but also their consistency versus variability across settings. We used dynamic stochastic actor-based models to analyze five waves of friendship network data across sixth through ninth grades for a large sample of U.S. adolescents. Our sample included two successive grade cohorts of youth in 26 school districts participating in the PROSPER study, yielding 51 longitudinal social networks based on respondents’ friendship nominations. For all three self-reported antisocial behaviors, we found evidence of both peer influence and selection processes tied to antisocial behavior. There was little reliable variance in these processes across the networks, suggesting that the statistical imprecision of the peer influence and selection estimates in previous studies likely accounts for inconsistencies in results. Adolescent friendship networks play a strong role in shaping problem behavior, but problem behaviors also inform friendship choices. In addition to preferring friends with similar levels of problem behavior, adolescents tend to choose friends who engage in problem behaviors, thus creating broader diffusion.

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Objectives: We examine the impacts of adolescent arrest on friendship networks. In particular, we extend labeling theory by testing hypotheses for three potential mechanisms of interpersonal exclusion related to the stigma of arrest: rejection, withdrawal, and homophily. Method: We use longitudinal data on 48 peer networks from PROSPER, a study of rural youth followed through middle and high school. We test our hypotheses using stochastic actor–based models. Results: Our findings suggest that arrested youth are less likely to receive friendship ties from school peers and are also less likely to extend them. Moreover, these negative associations are attenuated by higher levels of risky behaviors among peers, suggesting that results are driven by exclusion from normative rather than nonnormative friendships. We find evidence of homophily on arrest but it appears to be driven by other selection mechanisms rather than a direct preference for similarity on arrest. Conclusions: Overall, our findings speak to how an arrest may foster social exclusion in rural schools, thereby limiting social capital for already disadvantaged youth.