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From network ties to network structures: Exponential Random Graph Models of interorganizational relations

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  • Francesca Pallotti

    ()

  • Alessandro Lomi

    ()

  • Daniele Mascia

    ()

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    Abstract

    Theoretical accounts of network ties between organizations emphasize the interdependence of individual intentions, opportunities, and actions embedded in local configurations of network ties. These accounts are at odds with empirical models based on assumptions of independence between network ties. As a result, the relation between models for network ties and the observed network structure of interorganizational fields is problematic. Using original fieldwork and data that we have collected on collaborative network ties within a regional community of hospital organizations we estimate newly developed specifications of Exponential Random Graph Models (ERGM) that help to narrow the gap between theories and empirical models of interorganizational networks. After controlling for the main factors known to affect partner selection decisions, full models in which local dependencies between network ties are appropriately specified outperform restricted models in which such dependencies are left unspecified and only controlled for statistically. We use computational methods to show that networks based on empirical estimates produced by models accounting for local network dependencies reproduce with accuracy salient features of the global network structure that was actually observed. We show that models based on assumptions of independence between network ties do not. The results of the study suggest that mechanisms behind the formation of network ties between organizations are local, but their specification and identification depends on an accurate characterization of network structure. We discuss the implications of this view for current research on interorganizational networks, communities, and fields. Copyright Springer Science+Business Media B.V. 2013

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    File URL: http://hdl.handle.net/10.1007/s11135-011-9619-6
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    Bibliographic Info

    Article provided by Springer in its journal Quality & Quantity.

    Volume (Year): 47 (2013)
    Issue (Month): 3 (April)
    Pages: 1665-1685

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    Handle: RePEc:spr:qualqt:v:47:y:2013:i:3:p:1665-1685

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    Web page: http://www.springer.com/economics/journal/11135

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    Related research

    Keywords: Interorganizational networks; Interorganizational relations; Exponential Random Graph Models; Hospital organizations;

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    1. Hunter, David R. & Goodreau, Steven M. & Handcock, Mark S., 2008. "Goodness of Fit of Social Network Models," Journal of the American Statistical Association, American Statistical Association, vol. 103, pages 248-258, March.
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