Publications

Articles in peer-reviewed journals

Tore Opsahl, Filip Agneessens, John Skvoretz (2010). Node centrality in weighted networks: Generalizing degree and shortest paths. Social Networks 32 (3), 245-251, doi: 10.1016/j.socnet.2010.03.006.

Tore Opsahl, Pietro Panzarasa (2009). Clustering in weighted networks. Social Networks 31 (2), 155-163, doi: 10.1016/j.socnet.2009.02.002

Pietro Panzarasa, Tore Opsahl, Kathleen M. Carley (2009). Patterns and dynamics of users’ behavior and interaction: Network analysis of an online community. Journal of the American Society for Information Science and Technology 60 (5), 911-932, doi: 10.1002/asi.21015

Tore Opsahl, Vittoria Colizza, Pietro Panzarasa, José Javier Ramasco (2008). Prominence and control: The weighted rich-club effect. Physical Review Letters 101 (168702), doi: 10.1103/PhysRevLett.101.168702

Preprints

Tore Opsahl. Triadic closure in two-mode networks: Redefining the global and local clustering coefficients. Available in pdf-format (1.24mb; May 2010)

Cathrine Seierstad, Tore Opsahl. For the few not the many? The effects of affirmative action on presence, prominence, and social capital of female directors in Norway. Available at SSRN (802kb; April, 2010)

Adam Bock, Tore Opsahl, Gerard George. Business model innovation and strategic flexibility: A study of the effects of informal and formal organization. Available at SSRN (250kb; January, 2010)

Software

Tore Opsahl (2007-2010). tnet: Software for analysis of weighted, two-mode, and longitudinal networks. Available through The Comprehensive R Archive Network (CRAN).

Ph.D. thesis

Tore Opsahl (2009). Structure and evolution of weighted networks. University of London (Queen Mary College), London, UK

Conference proceedings and Invited talks

30: Adam J. Bock, Tore Opsahl, Gerard George (2010). Business model innovation and strategic flexibility: A study of the effects of informal and formal organization. Proceedings of the 2010 Annual Meeting of the Academy of Management, Academy of Management, Montréal, Canada

29: Reddi Kotha, Tore Opsahl, Pascale Crama, Gerard George (2010). Risk and capabilities: A multilevel approach to the governance of university licensing contracts. Proceedings of the 2010 Annual Meeting of the Academy of Management, Academy of Management, Montréal, Canada

28: Tore Opsahl (2010). Revisiting small-world networks: Is the world small? Invited Talk, The ISI Foundation, Turin, Italy

27: Tore Opsahl (2010). Triadic closure in two-mode networks: Redefining the global and local clustering coefficients. Proceedings of the International Sunbelt Social Network Conference 30, International Network for Social Network Analysis, Lake Garda, Italy

26: Jonathan Pinto, Tore Opsahl (2010). Interdependence, risk, and relational hiring. Proceedings for the 4th Annual Conference on Cultural Production in a Global Context: The Worldwide Film Industries, Grenoble Ecole de Management, Grenoble, France

25: Adam J. Bock, Tore Opsahl, Gerard George (2010). Business model innovation and strategic flexibility: A study of the effects of informal and formal organization. Proceedings of the 2010 The Sumantra Ghoshal Strategy Conference on Managerially Relevant Research, London Business School, London, UK

24: Reddi Kotha, Tore Opsahl, Pascale Crama, Gerard George (2010). Risk and capabilities: A multilevel approach to the governance of university licensing contracts. Proceedings of the 2010 Wharton Technology Conference, Wharton School, University of Pennsylvania, PA, USA

23: Tore Opsahl (2009). Clustering in two-mode networks. Proceedings of the Conference and Workshop on Two-Mode Social Analysis, VU University Amsterdam, Amsterdam, The Netherlands

22: Tore Opsahl (2009). Prominence and control: The weighted rich-club effect. Invited Talk, Nuffield/OII Networks Seminar Series, Oxford University, Oxford, UK

21: Tore Opsahl, Pietro Panzarasa, Martha J. Prevezer (2008). Clusters and social networks: The role of geographical and social distances in the evolution of inventor networks in China. Proceedings of the 25th Danish Research Unit for Industrial Dynamics (DRUID) Conference, Copenhagen Business School, Copenhagen, Denmark

20: Tore Opsahl, Pietro Panzarasa (2008). Mechanisms of network dynamics: Theoretical framework and methodological considerations. Proceedings of the UK Social Network Conference 2008, University of Greenwich, London, UK

19: Alessandra Gazzani Marinelli, Tore Opsahl, Pietro Panzarasa (2008). Uncovering the structure and nature of social interaction in online communities: Integrating the social network perspective with content analysis. Proceedings of the UK Social Network Conference 2008, University of Greenwich, London, UK

18: Pietro Panzarasa, Tore Opsahl (2008). Patterns of scientific collaboration in business and management: The effects of network structure and interdisciplinarity on research performance. Proceedings of the UK Social Network Conference 2008, University of Greenwich, London, UK

17: Tore Opsahl, Pietro Panzarasa (2008). Clustering in weighted networks. Proceedings of the International Workshop and Conference on Network Science (NetSci’08; poster), Norwich BioScience Institutes, Norwich, UK

16: Pietro Panzarasa, Tore Opsahl (2008). Patterns of scientific collaboration in business and management: The effects of network structure and interdisciplinarity on research performance. Proceedings of the International Workshop and Conference on Network Science (NetSci’08), Norwich BioScience Institutes, Norwich, UK.

Note: This presentation received coverage in the journal Nature (Vol 455, 9 October 2008).

15: Pietro Panzarasa, Tore Opsahl (2008). Inter-disciplinarity and research performance: Evidence from a scientific collaborative network in business and management. Proceedings of Cass Business School’s Workshop on Scientific and Managerial Knowledge, City University, London, UK

14: Tore Opsahl, Pietro Panzarasa (2008). Mechanisms of network dynamics: Theoretical framework and methodological considerations. Proceedings of the International Sunbelt Social Network Conference 28, International Network for Social Network Analysis, Tampa, FL, USA

13: Pietro Panzarasa, Tore Opsahl (2008). Interdisciplinarity and research performance: Evidence from a scientific collaborative network between academic departments. Proceedings of the International Sunbelt Social Network Conference 28, International Network for Social Network Analysis, Tampa, FL, USA

12: Tore Opsahl (2008). Weighted networks measures. Invited Talk, The ISI Foundation, Turin, Italy

11: Pietro Panzarasa, Tore Opsahl (2007). The structure of the coauthorship network in business and management. Proceedings of the American Sociological Association’s 102nd Annual Meeting, American Sociological Association, New York City, NY, USA

10: Pietro Panzarasa, Tore Opsahl (2007). Scientific collaborations in business and management: The effects of network structure on research performance. Proceedings of the 2007 Annual Meeting of the Academy of Management, Academy of Management, Philadelphia, PA, USA

9: Tore Opsahl, Pietro Panzarasa (2007). Scientific collaborations in business and management: The effects of network structure on research performance. Proceedings of the UK Social Network Conference 2007, Queen Mary College, University of London, London, UK

8: Pietro Panzarasa, Tore Opsahl (2007). Network evolution and interpersonal dynamics: An empirical investigations of online communication. Proceedings of the UK Social Network Conference 2007, Queen Mary College, University of London, London, UK

7: Tore Opsahl, Pietro Panzarasa (2007). Clustering in weighted networks. Proceedings of the International Sunbelt Social Network Conference 27, International Network for Social Network Analysis, Corfu, Greece

6: Pietro Panzarasa, Tore Opsahl (2007). Growth mechanisms for evolving social networks: Triadic closure, homophily and tie strength. Proceedings of the International Sunbelt Social Network Conference 27, International Network for Social Network Analysis, Corfu, Greece

5: Tore Opsahl, Pietro Panzarasa (2006). Valued clustering coefficient. Proceedings of Applications of Social Network Analysis, Institute of Mass Communication and Media Research, University of Zurich, Zurich, Switzerland

4: Pietro Panzarasa, Tore Opsahl (2006). The network structure and evolution of online communication. Proceedings of European Conference on Complex Systems, Saïd Business School, Oxford University, Oxford, UK

3: Pietro Panzarasa, Tore Opsahl, Shamama Abulkhairi, Susanne Sorge, Michael Rowlinson (2006). Patterns of scientific collaboration in business and management: A study of the coauthorship network from the 2001 Research Assessment Exercise in the UK. Proceedings of the Social Network Analysis Forum, University of Leeds, Leeds, UK

2: Pietro Panzarasa, Tore Opsahl (2006). The structure and evolution of an online communication network. Proceedings of the International Sunbelt Social Network Conference 26, International Network for Social Network Analysis, Vancouver, Canada

1: Tore Opsahl, Pietro Panzarasa (2005). The network structure of online communication. Proceedings of the Social Network Analysis Forum, Centre for Criminology, Oxford University, Oxford, UK