Thomas W. Valente

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W study how opinion leadership and social contagion within social networks affect the adoption of a new product. In contrast to earlier studies, we find evidence of contagion operating over network ties, even after controlling for marketing effort and arbitrary systemwide changes. More importantly, we also find that the amount of contagion is moderated by(More)
This article summarizes research on Type II translation of prevention interventions aimed at enhancing the adoption of effective programs and practices in communities. The primary goal of Type II translation is to institutionalize evidence-based programs, products, and services. First, the authors describe theoretical frameworks that are useful to guide(More)
The ability to measure centrality in social networks has been a particularly useful development in social network analysis. For researchers trying to decide which centrality measure is most meaningful and valid for their research purposes, various papers have explored the conceptual foundations of centrality measures. Less well documented is the empirical(More)
A basic puzzle posed by innovation diffusion is why long lags occur between an innovation’s first appearance and its general acceptance by a population. Among the factors that have been suggested are delays in acting on information, a desire to conform, learning from others, and changes in external factors such as prices. There is an extensive literature on(More)
OBJECTIVE To test whether a social network tailored substance abuse prevention program can reduce substance use among high-risk adolescents without creating deviancy training (iatrogenic effects). METHODS A classroom randomized controlled trial comparing control classes with those receiving an evidence-based substance use prevention program [Towards No(More)
This article reviews 10 techniques used to identify opinion leaders to promote behavior change. Opinion leaders can act as gatekeepers for interventions, help change social norms, and accelerate behavior change. Few studies document the manner in which opinion leaders are identified, recruited, and trained to promote health. The authors categorize close to(More)
OBJECTIVES This study characterized social network context of HIV risk behavior among injection drug users who participated in a needle exchange program. METHODS Interviews were conducted with 1184 injection drug users at the Baltimore Needle Exchange Program enrolled in an evaluation cohort. Analysis consisted of multiple logistic regression with(More)
The term "network interventions" describes the process of using social network data to accelerate behavior change or improve organizational performance. In this Review, four strategies for network interventions are described, each of which has multiple tactical alternatives. Many of these tactics can incorporate different mathematical algorithms.(More)