Publications
Articles in peer-reviewed journals
Tore Opsahl (2013). Triadic closure in two-mode networks: Redefining the global and local clustering coefficients. Social Networks 35, doi: 10.1016/j.socnet.2011.07.001
Tufool Al-Nuaimi, Tore Opsahl, Gerard George (2012). Innovating in the Periphery: The Impact of Local and Foreign Labour Mobility on the Innovative Performance of Indian Organizations. Research Policy 41 (9), 1534-1543, doi: 10.1016/j.respol.2012.06.001
Adam J. Bock, Tore Opsahl, Gerard George, David M. Gann (2012). The effects of culture and structure on strategic flexibility during business model innovation. Journal of Management Studies 49 (2), 279–462, doi: 10.1111/j.1467-6486.2011.01030.x
Cathrine Seierstad, Tore Opsahl (2011). For the few not the many? The effects of affirmative action on presence, prominence, and social capital of women directors in Norway. Scandinavian Journal of Management 27 (1), 44-54, doi: 10.1016/j.scaman.2010.10.002; supporting website
Note: This paper received coverage in the major Norwegian newspapers (online versions on e24.no and dn.no) and Der Spiegel
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
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, Pietro Panzarasa (2009). Clustering in weighted networks. Social Networks 31 (2), 155-163, doi: 10.1016/j.socnet.2009.02.002
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
Citation information: ResearcherID (Web of Knowledge/Science) and Google Scholar
Working papers and preprints
Tore Opsahl, Bernie Hogan. Growth mechanisms in continuously-observed networks: Communication in a Facebook-like community. arXiv:1010.2141 (October 11, 2010)
Tore Opsahl, Tufool Al-Nuaimi, Gerard George. Revisiting small-world networks: The world is not small
Andreas B. Eisingerich, Tore Opsahl, Gerard George. Profiting from Innovation: When do CEOs perceive that CMOs add value to Innovation?
Anne ter Wal, Tore Opsahl. Trading proximities: The determinants of tie formation in inventor networks
Gerard George, Tore Opsahl, Ted Baker. Global delivery of health care intervention: Organisational design for effective prevention of mother-to-child transmission of HIV
Tufool Al-Nuaimi, Tore Opsahl, Gerard George. Playing Catch-Up: Updating the Network Perspective in Management
Reddi Rayalu Kotha, Tore Opsahl, Pascale Crama, Gerard George. Licensing of university science: Tacitness and the impact of invention and governance capability on contract type
Thorsten Grohsjean, Paola Criscuolo, Tore Opsahl, Ammon Salter. The chosen ones: The selection of capabilities in professional service firms
Patents
S.B. Pawar, G.D. Farley, D. Nair, D. Joa, T.J. Bendel, H. Kagade, T. Opsahl, S. Banerjee (2015). Comprehensive exposure revenue analytics. US20150170066.
S.B. Pawar, G.D. Farley, D. Nair, D. Joa, T.J. Bendel, H. Kagade, T. Opsahl, S. Banerjee (2015). Comprehensive exposure network analysis. US20150170076.
Software
Tore Opsahl (2007-2012). 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, London, UK
Conference presentations, workshops, invited talks, and speaking engagements
May, 2013: Tore Opsahl, Antoine Vernet. Applying weighted and/or two-mode metrics to the small-world question: The world is not small. Proceedings of the International Sunbelt Social Network Conference 33, International Network for Social Network Analysis, Hamburg, Germany
May, 2013: Tore Opsahl. Workshop on tnet: Software for Analysis of Weighted, Two-mode, and Longitudinal networks at the International Sunbelt Social Network Conference 33, International Network for Social Network Analysis, Hamburg, Germany
January 17, 2013: Tore Opsahl. Data Mining and Start-ups at Imperial College London, London, UK
May 25, 2012: Tore Opsahl. Workshop on tnet: Software for Analysis of Weighted, Two-mode, and Longitudinal networks at University of Manchester, Manchester, UK
March 15, 2012: Tore Opsahl, Bernie Hogan. Growth mechanisms in continuously-observed networks: Communication in a Facebook-like community. Proceedings of the International Sunbelt Social Network Conference 32, International Network for Social Network Analysis, Redondo Beach, California, USA
March 14, 2012: Tore Opsahl. Workshop on tnet: Software for Analysis of Weighted, Two-mode, and Longitudinal networks at the International Sunbelt Social Network Conference 32, International Network for Social Network Analysis, Redondo Beach, California, USA
March 14, 2012: Antoine Vernet, Tore Opsahl. Collaborations in the movie industry: Dynamics of a two-mode network. Proceedings of the International Sunbelt Social Network Conference 32, International Network for Social Network Analysis, Redondo Beach, California, USA
January 30, 2012: Tore Opsahl, Bernie Hogan. Modeling the evolution of continuously-observed networks: Communication in a Facebook-like community. Invited Talk, Nuffield College and the Oxford Internet Institute, University of Oxford, Oxford, UK
November 11, 2011: Tore Opsahl, Bernie Hogan. Modeling the evolution of continuously-observed networks: Communication in a Facebook-like community. Invited Talk, External Seminar Series, Greenwich Business School, University of Greenwich, London, UK
October 18, 2011: Tore Opsahl. Securely using RSiena on Amazon’s EC2. Invited Talk, Advanced Statistical Network Modelling Group Meeting, Nuffield College, University of Oxford, Oxford, UK
August 16, 2011: Adam Bock, Tore Opsahl. The effect of culture and structure on strategic flexibility during business model innovation. Proceedings of the 2011 Annual Meeting of the Academy of Management, Academy of Management, San Antonio, Texas, USA
August 16, 2011: Reddi Kotha, Tore Opsahl, Pascale Crama. Licensing of university science: Tacitness and contract type. Proceedings of the 2011 Annual Meeting of the Academy of Management, Academy of Management, San Antonio, Texas, USA
July 8, 2011: Tore Opsahl. Revisiting small-world networks: Is the world small? Proceedings of the 7th UK Social Networks Conference, University of Greenwich, London, UK
July 5, 2011: Tore Opsahl. Workshop on tnet: Software for Analysis of Weighted, Two-mode, and Longitudinal networks at the 7th UK Social Networks Conference, University of Greenwich, London, UK
February 12, 2011: Tore Opsahl. Revisiting small-world networks: Is the world small? Proceedings of the International Sunbelt Social Network Conference 31, International Network for Social Network Analysis, St. Pete Beach, Florida, USA
February 9, 2011: Tore Opsahl. Workshop on tnet: Software for Analysis of Weighted, Two-mode, and Longitudinal networks at the International Sunbelt Social Network Conference 31, International Network for Social Network Analysis, St. Pete Beach, Florida, USA
November 18, 2010: Tore Opsahl, Bernie Hogan. Growth mechanisms in continuously-observed networks: Communication in a Facebook-like community. Proceedings of the Workshop on the Future of Social Networking: Experts from Industry and Academia (poster), University of Cambridge, Cambridge, UK
November 2, 2010: Tore Opsahl. Communication in a Facebook-like community. Invited Talk, CABDyN seminar series, Saïd Business School, Oxford University, Oxford, UK
August 24, 2010: Tore Opsahl. Engines for Recovery: The role of social networks (Google, Facebook, Twitter, Myspace, etc.) in the growth of business. Speaking engagement for the Diamond Trading Company (part of the De Beers Family of Companies) during their 2010 Business Excellence Seminar for Sightholders, London, UK
Note: This presentation received coverage on the International Diamond Exchange and Diamonds.net
August 10, 2010: Adam J. Bock, Tore Opsahl, Gerard George. 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
August 9, 2010: Reddi Kotha, Tore Opsahl, Pascale Crama, Gerard George. 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
July 5, 2010: Tore Opsahl. Revisiting small-world networks: Is the world small? Invited Talk, The ISI Foundation, Turin, Italy
July 1,2010: Tore Opsahl. 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, Riva del Garda, Italy
June 30, 2010: Tore Opsahl. Workshop on tnet: Software for Analysis of Weighted, Two-mode, and Longitudinal networks at the International Sunbelt Social Network Conference 30, International Network for Social Network Analysis, Riva del Garda, Italy
June 5, 2010: Jonathan Pinto, Tore Opsahl. 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
May 16, 2010: Adam J. Bock, Tore Opsahl, Gerard George. 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
April 23, 2010: Reddi Kotha, Tore Opsahl, Pascale Crama, Gerard George. 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
October 1, 2009: Tore Opsahl. Clustering in two-mode networks. Proceedings of the Conference and Workshop on Two-Mode Social Analysis, VU University Amsterdam, Amsterdam, The Netherlands
April 27, 2009: Tore Opsahl. Prominence and control: The weighted rich-club effect. Invited Talk, Nuffield/OII Networks Seminar Series, Oxford University, Oxford, UK
July 20, 2008: Tore Opsahl, Pietro Panzarasa. Mechanisms of network dynamics: Theoretical framework and methodological considerations. Proceedings of the UK Social Network Conference 2008, University of Greenwich, London, UK
July 19, 2008: Alessandra Gazzani Marinelli, Tore Opsahl, Pietro Panzarasa. 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
July 19, 2008: Pietro Panzarasa, Tore Opsahl. 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
June 27, 2008: Tore Opsahl, Pietro Panzarasa. Clustering in weighted networks. Proceedings of the International Workshop and Conference on Network Science (NetSci’08; poster), Norwich BioScience Institutes, Norwich, UK
June 27, 2008: Pietro Panzarasa, Tore Opsahl. 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).
June 25, 2008: Pietro Panzarasa, Tore Opsahl. 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
June 19, 2008: Tore Opsahl, Pietro Panzarasa, Martha J. Prevezer. 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
January 24, 2008: Pietro Panzarasa, Tore Opsahl. 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
January 23, 2008: Tore Opsahl, Pietro Panzarasa. 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
January 11, 2008: Tore Opsahl. Weighted networks measures. Invited Talk, The ISI Foundation, Turin, Italy
August 11, 2007: Pietro Panzarasa, Tore Opsahl. 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
August 7, 2007: Pietro Panzarasa, Tore Opsahl. 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
July 14, 2007: Tore Opsahl, Pietro Panzarasa. 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
July 14, 2007: Pietro Panzarasa, Tore Opsahl. 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
May 5, 2007: Tore Opsahl, Pietro Panzarasa. Clustering in weighted networks. Proceedings of the International Sunbelt Social Network Conference 27, International Network for Social Network Analysis, Corfu, Greece
May 4, 2007: Pietro Panzarasa, Tore Opsahl. 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
October 5, 2006: Tore Opsahl, Pietro Panzarasa. Valued clustering coefficient. Proceedings of Applications of Social Network Analysis, Institute of Mass Communication and Media Research, University of Zurich, Zurich, Switzerland
September 26, 2006: Pietro Panzarasa, Tore Opsahl. The network structure and evolution of online communication. Proceedings of European Conference on Complex Systems, Saïd Business School, Oxford University, Oxford, UK
July 2006: Pietro Panzarasa, Tore Opsahl, Shamama Abulkhairi, Susanne Sorge, Michael Rowlinson. 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
April 28, 2006: Pietro Panzarasa, Tore Opsahl. 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
July 16, 2005: Tore Opsahl, Pietro Panzarasa. The network structure of online communication. Proceedings of the Social Network Analysis Forum, Centre for Criminology, Oxford University, Oxford, UK
Tore Opsahl 