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dc.contributor.authorPin, Paoloen_US
dc.contributor.authorFranz, Silvioen_US
dc.contributor.authorMarsili, Matteoen_US
dc.description.abstractOur societies are heterogeneous in many dimensions such as census, education, religion, ethnic and cultural composition. The links between individuals - e.g. by friendship, marriage or collaboration - are not evenly distributed, but rather tend to be concentrated within the same group. This phenomenon, called imbreeding homophily, has been related to either (social) preference for links with own-type individuals ( choice-based homophily) or to the prevalence of individuals of her same type in the choice set of an individual ( opportunity-based homophily). We propose an indicator to distinguish between these effects for minority groups. This is based on the observation that, in environments with unbiased opportunities, as the relative size of the minority gets small, individuals of the minority rarely meet and have the chance to establish links together. Therefore the effect of choice-based homophily gets weaker and weaker asthe size of the minority shrinks. We test this idea across the dimensions of race andeducation on data on US marriages, and across race on friendships in US schools, andfind that: for what concerns education i) opportunity-based homophily is much strongerthan choice--based homophily and ii) they are both remarkably stationary in time;concerning race iii) school friendships do not exhibit opportunity-based homophily,while marriages do, iv) choice-based homophily is much stronger for marriages than forfriendships and v) these effects vary widely across race.en_US
dc.publisher|aFondazione Eni Enrico Mattei (FEEM) |cMilanoen_US
dc.relation.ispartofseries|aNota di lavoro // Fondazione Eni Enrico Mattei: CTN, Coalition theory network |x2008,24en_US
dc.subject.keywordSocial Networks-
dc.subject.keywordChoice-Based and Opportunity-Based Homophily-
dc.subject.stwSoziale Beziehungenen_US
dc.subject.stwSoziales Netzwerken_US
dc.titleOpportunity and choice in social networksen_US
dc.type|aWorking Paperen_US

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