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Title: Identification of Peer Effects through Social Networks
Authors: Bramoullé, Yann
Djebbari, Habiba
Fortin, Bernard
Keywords: Social networks
Peer effects
Identification
Reflection problem
Issue Date: 2007-02
Series/Report no.: Cahiers du CIRPÉE;07-05
Abstract: We provide new results regarding the identification of peer effects. We consider an extended version of the linear-in-means model where each individual has his own specific reference group. Interactions are thus structured through a social network. We assume that correlated unobservables are either absent, or treated as fixed effects at the component level. In both cases, we provide easy-to-check necessary and sufficient conditions for identification. We show that endogenous and exogenous effects are generally identified under network interaction, although identification may fail for some particular structures. Monte Carlo simulations provide an analysis of the effects of some crucial characteristics of a network (i.e., density, intransitivity) on the estimates of social effects. Our approach generalizes a number of previous results due to Manski (1993), Moffitt (2001), and Lee (2006).
URI: http://132.203.59.36/CIRPEE/cahierscirpee/2007/files/CIRPEE07-05.pdf
https://depot.erudit.org/id/001045dd
Appears in Collections:Cahiers de recherche du CIRPÉE

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