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Dear Gohar Feroz Kahn,


You may also take a look at http://www.leydesdorff.net/visone for a version of visone that we (Thomas Schank and I) constructed for this purpose. The version reads dynamic .paj-files.


Loet Leydesdorff, Thomas Schank, Andrea Scharnhorst, & Wouter De Nooy, Animating the development of Social Networks over time using a dynamic extension of multidimensional scaling. El Profesional de la Información 17(6) (2008) 611-626. http://www.elprofesionaldelainformacion.com/contenidos/2008/noviembre/04.pdf


The paper contains also a dynamic co-author network (of Social Networks).





Loet Leydesdorff

Professor, University of Amsterdam
Amsterdam School of Communications Research (ASCoR)

Kloveniersburgwal 48, 1012 CX Amsterdam
[log in to unmask] ; http://www.leydesdorff.net/
Honorary Professor, SPRU, University of Sussex; Visiting Professor, ISTIC, Beijing;


From: Social Networks Discussion Forum [mailto:[log in to unmask]] On Behalf Of G.F.Khan
Sent: Thursday, September 19, 2013 11:26 AM
To: [log in to unmask]
Subject: Longitudinal co-authorship network analysis-response summery


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Dear Group Members,

Once again thank you for your inputs. Below I summarized the responses.

What to look for when investigating longitudinal co-authorship networks?

One may look for or use:

ˇ        "partitions to slice and dice the data and track changes over time.” (suggested by Dr. John McCreery)—more details can be found here: http://www.slideshare.net/jlmccreery

ˇ         “Betweenness centralization, Fragmentation coefficient, Triad count or simmellian ties, changes in reciprocal ties as both a percentage and total amount (for directed networks), and specialization and cognitive demand (for meta networks—more than just people to people network).” (suggested Dr. Ian McCulloh)

ˇ        "the latent dimensions of the vector space using factor analysis of the (asymmetrical) documents/authors matrix or community finding algorithms in the coauthor matrices (Blondel).” (suggested by Prof. Loet Leydesdorff)

ˇ        “how, over time, the network develops -- includes people from various universities/countries/sub-disciplines... maybe measure increasing/decreasing diversity/homophily over time?” (suggested  by Dr. Valdis Krebs)

ˇ        One can also include measures, such as citation received, number of new players added (e.g., authors, countries, and institutions), structure holes, and new knowledge created (e.g., emerging themes and topics) (this is my opinion).

ˇ        However, in a off list discussion with Prof. Barry, we tend to agree that the question of effective-efficient co-authorship network needs to be discussed further. What an effective-efficient co-authorship network means?

How to slice and dice the network?

From the responses it seem that you can slice and dice data the way you like. It can be year by year, every four year, every five year, or every 10 years (it may depend on your research settings).  

Resources/studies suggested

Howard D. White, Nancy Nazer, and Barry Wellman (2004) "Does Citation Reflect Social Structure? Longitudinal Evidence from the 'Globenet' Interdisciplinary Reserach Group", [Journal of the American Society for Information Science and Technology 55, 2 (January 2004): 111-26.]

Loet Leydesdorff, Robert L. Goldstone, Interdisciplinarity at the Journal and Specialty Level: The changing knowledge bases of the journal Cognitive Science. Link: http://arxiv.org/abs/1212.0823

Trier, M. & Molka-Danielsen, J. (2013). Sympathy or strategy: social capital drivers for collaborative contributions to the IS community. European Journal of Information Systems, 22(3), 317-335. Link: http://dx.doi.org/10.1057/ejis.2012.27

A comparison of time periods and a related video of the dynamic evolution of
the network: http://www.commetrix.net/irisnetwork

SNA tool Commetrix: commetrix.net




Khan, Gohar Feroz (PhD)
Assistant Professor
Korea University of Technology & Education (KoreaTECH)
1600 Chungjol-ro Byungcheon-myun
Cheonan city, 330-708, South Korea
Office: 82-41-560-1415; Mobile: +82-10-5510-8071
email: [log in to unmask] 

Director Center for Social Technologies
Associate Editor Journal of Contemporary Eastern Asia 
I blog here


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_____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.insna.org). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.