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A dyadic reciprocity index for repeated interaction networks*

Published online by Cambridge University Press:  15 April 2013

CHENG WANG
Affiliation:
Department of Sociology, University of Notre Dame, 810 Flanner Hall, Notre Dame, IN 46556, USA Interdisciplinary Center for Network Science and Applications (ICeNSA), 384E Nieuwland Science Hall, Notre Dame, IN 46556, USA (e-mail: cwang3@nd.edu, olizardo@nd.edu, dshachen@nd.edu)
OMAR LIZARDO
Affiliation:
Department of Sociology, University of Notre Dame, 810 Flanner Hall, Notre Dame, IN 46556, USA Interdisciplinary Center for Network Science and Applications (ICeNSA), 384E Nieuwland Science Hall, Notre Dame, IN 46556, USA (e-mail: cwang3@nd.edu, olizardo@nd.edu, dshachen@nd.edu)
DAVID HACHEN
Affiliation:
Department of Sociology, University of Notre Dame, 810 Flanner Hall, Notre Dame, IN 46556, USA Interdisciplinary Center for Network Science and Applications (ICeNSA), 384E Nieuwland Science Hall, Notre Dame, IN 46556, USA (e-mail: cwang3@nd.edu, olizardo@nd.edu, dshachen@nd.edu)
ANTHONY STRATHMAN
Affiliation:
Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA Interdisciplinary Center for Network Science and Applications (ICeNSA), 384E Nieuwland Science Hall, Notre Dame, IN 46556, USA (e-mail: astrathm@nd.edu, toro@nd.edu)
ZOLTÁN TOROCZKAI
Affiliation:
Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA Interdisciplinary Center for Network Science and Applications (ICeNSA), 384E Nieuwland Science Hall, Notre Dame, IN 46556, USA (e-mail: astrathm@nd.edu, toro@nd.edu)
NITESH V. CHAWLA
Affiliation:
Department of Computer Science and Engineering, College of Engineering, University of Notre Dame, 384 Fitzpatrick Hall, Notre Dame, IN 46556, USA Interdisciplinary Center for Network Science and Applications (ICeNSA), 384E Nieuwland Science Hall, Notre Dame IN 46556, USA (e-mail: nchawla@nd.edu)
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Abstract

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A wide variety of networked systems in human societies are composed of repeated communications between actors. A dyadic relationship made up of repeated interactions may be reciprocal (both actors have the same probability of directing a communication attempt to the other) or non-reciprocal (one actor has a higher probability of initiating a communication attempt than the other). In this paper we propose a theoretically motivated index of reciprocity appropriate for networks formed from repeated interactions based on these probabilities. We go on to examine the distribution of reciprocity in a large-scale social network built from trace-logs of over a billion cell-phone communication events across millions of actors in a large industrialized country. We find that while most relationships tend toward reciprocity, a substantial minority of relationships exhibit large levels of non-reciprocity. This is puzzling because behavioral theories in social science predict that persons will selectively terminate non-reciprocal relationships, keeping only those that approach reciprocity. We point to two structural features of human communication behavior and relationship formation—the division of contacts into strong and weak ties and degree-based assortativity—that either help or hinder the ability of persons to obtain communicative balance in their relationships. We examine the extent to which deviations from reciprocity in the observed network are partially traceable to the operation of these countervailing tendencies.

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Type
Research Article
Copyright
Copyright © Cambridge University Press 2013