27/02/2026
All are welcome to attend a presentation by our Invited Speaker
Dr Andrås Vörös, University of Birmingham, UK in E1-022, Monday 2nd March at 1pm
âSocial contagion or behaviour spillover? The dynamics of multiple health behaviours and social networksâ
Abstract: Research on social influence, or âsocial contagionâ, in networks tends to focus on processes that shape a single behaviour at a time. However, our behaviours do not exist in isolation: they depend on some of our other behaviours. This appears particularly important in the case of health behaviours. For example, smokers tend to consume alcohol and exercise less. Therefore, to understand, and change, smoking habits, we need to understand how smoking co-depends on drinking and physical activity. Thanks to recent advances in statistical network modelling, we can take these processes into account when examining social influence on behaviours. I present an empirical showcase for studying the co-evolution of social networks and multiple behaviours in the context of adolescent health. Using data from secondary-school classrooms in the German and Swedish subsamples of the CILS4EU study, I examine how seven health behaviours related to substance use, diet, and physical activity are shaped by peer friendship networks. I apply stochastic actor-oriented models to estimate the effects of different processes of influence, network selection (e.g., homophily), and behaviour âspilloverâ on the studied set of behaviours. The study presents a feasible approach to developing and testing hypotheses about complex processes of behaviour change in social networks. I discuss how this may contribute to understanding the dynamics of social structure, such as group formation and polarisation.
Dr Andrås Vörös is an Associate Professor in Quantitative Methods at the School of Social Policy and Society, University of Birmingham, UK. Andrås's research focuses on the measurement and statistical analysis of social networks (both offline and online) in various settings. He interested in how social relations evolve over time and how they affect individual and group outcomes. He has experience collecting empirical data and modelling such phenomena in educational and professional contexts. For more information see https://www.birmingham.ac.uk/staff/profiles/social-policy/voros-andras