NEIGHBORHOOD CONTEXT AND NONLINEAR PEER EFFECTS ON ADOLESCENT VIOLENT CRIME*

Although evidence of the strong correlation between deviant behavior and exposure to deviant peers is overwhelming, researchers have yet to investigate whether a nonlinear functional form better captures this relationship than does a linear form. Researchers also have yet to examine the extent to which peer effects vary as a function of the neighborhood context. To address these issues, we use data from the Project on Human Development in Chicago Neighborhoods (PHDCN) to examine 1) the functional form of the relationship between peer violence exposure and self‐reported violent crime and 2) the extent to which the effect of exposure to violent peers on violence is ecologically structured. Estimates from logistic hierarchical models indicate that the effect of peer violence exposure on violent crime decreases at higher values of peer violence, as reflected in a nonlinear relationship (expressed in terms of log‐odds). Furthermore, exposure to violent peers increases along with neighborhood disadvantage, and the effect of peer violence exposure on violent crime is attenuated as neighborhood disadvantage increases, which is reflected in a cross‐level peer violence/disadvantage interaction.     

Beyond Environmental Regulatory Fragmentation: Signs of Integration in the Case of the Great Lakes Basin

Environmental regulatory fragmentation along the medium boundaries of air, land, and water in Canada and the United States serves to skiff pollutants from medium to medium rather than contain or eliminate them. This pattern is particularly evident in the Great Lakes Basin where many of the most pressing environmental problems stem from pollutant transfer across medium or jurisdictional lines. The impediments to more integrated environmental regulation remain considerable in the Basin, and include the enduring single-medium orientation of federal programs and limitations of state, provincial, or regional innovation. Nonetheless, there is growing indication that regulatory integration need not be dismissed as a theoretical nicety but political impossibility. A series of recent developments indicate a shift toward greater integration in the Basin, prompted in large part by environmental policy professionals who increasingly recognize the limitations of current approaches and are willing to devise alternatives. These developments are occurring at the regional as well as state and provincial levels, and they give far greater definition than ever before to the idea of integrated environmental regulation.     

DECOMPOSING THE PEER EFFECT ON ADOLESCENT SUBSTANCE USE: MEDIATION,NONLINEARITY, AND DIFFERENTIAL NONLINEARITY*

Although the correlation between peer delinquency and delinquency is one of the most consistently demonstrated findings in delinquency research, researchers have focused primarily on the direct, linear, and additive effects of peers in statistical models, rather than on empirically modeling mediating, nonlinear, and moderating processes that are specified by theory. To address these issues, we measure respondent delinquency and peer delinquency with illegal substance use and then decompose the effect of peer substance use on self‐reported substance use. Logistic hierarchical models on a sample of adolescents from the Project on Human Development in Chicago Neighborhoods (PHDCN) indicate that the effect of peer substance use on self‐reported substance use is partially mediated by perceptions of the health risks of substance use. In addition, the direct statistical effect of peers is nonlinear: On average, the peer effect decreases at higher values of peer substance use, which is consistent with a “saturation” effect. We also find that the functional form of the peer substance use/substance use relationship is dependent on the neighborhood context. In neighborhoods with more opportunities for crime, the peer effect is initially strong but decreases as peer substance use increases, which is consistent with a saturation effect. Conversely, in neighborhoods with fewer opportunities for crime, the effect of peers is initially small, but as delinquent peer associations increase, the peer effect increases multiplicatively.