Using a dynamical network model of society, we show that cooperation is the norm in the Hawks-Doves game when individuals are allowed to break ties with undesirable neighbors and to make new acquaintances in their extended neighborhood. This is an interesting result, as standard theory for mixing populations prescribes that a certain fraction of defectors must always exist at equilibrium. We di...

Does co-editing of Wikipedia articles reveal users dominating others? Do these dyadic dominance orderings (if any) lead to a global linear hierarchy among contributing users? In this article we claim that dominance (respectively deference) is revealed by users undoing (respectively redoing) edits of others. We propose methods to turn the history of Wikipedia pages into a dynamic multiplex netwo...

BACKGROUND We used data from a random telephone survey of 2045 adults in Recife, Brazil to investigate the associations of health-related quality of life (HRQoL) with selected factors. METHODS We generated odds ratios of 4 HRQoL measures (perception of overall health, mentally unhealthy days, physically unhealthy days, and physically and mentally unhealthy days impeding usual activities) by l...

We combine data from the Latin American Migration Project and the Mexican Migration Project to estimate models predicting the likelihood of taking of first and later trips to the United States from five nations: Mexico, the Dominican Republic, Costa Rica, Nicaragua, and Peru. The models test specific hypotheses about the effects of social capital on international migration and how these effects...

I investigate the complimentary roles of similarity on research interests, and of departmental co-membership on promoting new collaborative ties among professors at an elite American research university. Similarity is measured as cosine similarity of tf-idf calculations of their abstracts for published work, and is recalculated for each year in the study period. I find that similarity is a stro...

Using social network data from the American Social Fabric Project (ASFP), this study examines how distance to alters may lead different perceptions of neighborhood and city attachment among urban versus rural residents, considers which types relations play influential roles in shaping attachment. Overall, a key finding is that having more local ties positively associated with at both level leve...

This research assessed the direct and indirect influences of renovated public spaces (parks and sports facilities) on social cohesion and residential satisfaction, in the context of low and medium-low socio economic status individuals in Mexico. The research method is based on structural equation models. The findings of the study suggest the importance of public spaces in promoting informal soc...

Highly distributed, loosely organized, independent, informal work organizations sometimes manage both joint efforts and collective welfare at least as well as centralized bureaucracies do. This aligns closely with the view that markets are superior to bureaucracies as ways of organizing both joint efforts and collective welfare. There are other forms of work organization between perfect markets...

BACKGROUND Little research has focused on the spatial distribution of social capital, despite social capital's rising popularity in health research and policy. This study examines the neighborhood differences in social capital and the determinants that explain these differences. METHODS Five components of neighborhood social capital are identified by means of factor and reliability analyses u...