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*****  To join INSNA, visit http://www.insna.org  *****

Dear Thomas,

we did some work on a very similar topic. We described centrality
measures within the Friendfeed social network and then we described
how actual conversations were happening within that SNS (please note
that in FF conversations may happen also among users not connected so
conversations flows do not necessarily use existing connections). Our
work is still unpublished but if you might be interested I could send
you a draft version.
Otherwise if you're interested in the raw data in our website you can
download a whole dataset of Friendfeed data and users
(http://larica.uniurb.it/sigsna/data/)

Hope it helps

Luca



On Tue, Apr 12, 2011 at 9:09 PM, Allison Hopkins <[log in to unmask]> wrote:
> ***** To join INSNA, visit http://www.insna.org *****
>
> Hi Thomas,
>
> I carried out some research recently that is relevant to your post. In my
> study I was interested in using regression and centrality measures along
> with a measure of knowledge to better understanding medicinal plant remedy
> knowledge transmission in a rural community in Mexico. The method is
> detailed in my paper titled “Use of network centrality measures to explain
> individual levels of herbal remedy cultural competence among the Yucatec
> Maya in Tabi, Mexico” coming out very soon in Field Methods. See the
> abstract below for more information.
>
> My findings were that in-degree correlated with the competence scores (a
> measure of knowledge) with an r of 0.28, p<.01. When I ran the regression
> and included attribute variables, such as age and gender, along with
> centrality measures, such as in-degree and betweenness, the model explained
> 26% of the variation in knowledge scores. Interestingly, age trumped all
> other variables, including the network variables in its explanatory power.
> After doing some further analysis to explain this finding I determined that
> age and in degree are positively associated (r = .48, p < .01), which
> suggests that, as generally expected, the trend in Tabi is that older people
> are both the most knowledgeable and the most centrally located in the
> network.
>
>
>
> Abstract for Field Methods paper
>
> Common herbal remedy knowledge varies and is transmitted among individuals
> who are connected through a social network. Thus, social relationships have
> the potential to account for some of the variation in knowledge. Cultural
> consensus analysis (CCA) and social network analysis (SNA) were used
> together to study the association between intracultural variation in
> botanical remedy knowledge and social relationships in Tabi, Yucatan,
> Mexico. CCA, a theory of culture as agreement, was used to assess the
> competence of individuals in a domain of herbal remedies by measuring
> individual competence scores within that domain. There was a weak but
> positive association between these competence scores and network centrality
> scores. This association disappeared when age was included in the model.
> People in Tabi, who have higher competence in herbal remedies tend to be
> older and more centrally located in the herbal remedy inquiry network. The
> larger implication of the application of CCA and SNA for understanding the
> acquisition and transmission of cultural knowledge is also explored.
>
>
>
> For more information about the study see chapter 5 of my dissertation
> available at: http://etd.fcla.edu/UF/UFE0041175/hopkins_a.pdf
>
> Kind regards,
>
> Allison Hopkins, PhD
>
>
>
> ________________________________
> Date: Tue, 12 Apr 2011 13:49:22 -0400
> From: [log in to unmask]
> Subject: Re: [SOCNET] Network Regression of centrality measures vs. actual
> transmission of information
> To: [log in to unmask]
>
> ***** To join INSNA, visit http://www.insna.org ***** Thomas,
>
> We have a paper coming out in the American Journal of Sociology that
> addresses these types of issues. There we test the fundamental assumptions
> of Granovetter's 'The Strength of Weak Ties' and Burt's 'Structural Holes'
> by combining analysis of email structure with analysis of email content. We
> ask: Which structural positions actually deliver the most novel information
> to ego?
>
> We find that that a trade-off between network diversity and communications
> bandwidth regulates access to novel information and that information
> advantages to brokerage depend on (a) whether the information overlap among
> alters is small enough to justify bridging structural holes, (b) whether the
> size of the topic space known to alters is large enough to consistently
> provide novelty, and (c) whether the knowledge stock of alters refreshes
> enough over time to justify updating what was previously known. These
> results suggest that information benefits to brokerage depend on the
> information environments in which brokers find themselves.
>
> You can find a working paper version of the forthcoming article here:
>
> Aral, S. & Van Alstyne, M. “Networks, Information and Brokerage: The
> Diversity-Bandwidth
> Tradeoff.” American Journal of Sociology. In Press. Available at SSRN:
> http://ssrn.com/abstract=958158
>
> Best
>
> Sinan
>
> Sinan Aral
> Assistant Professor, NYU Stern School of Business.
> Research Affiliate, MIT Sloan School of Management.
> Personal Webpage: http://pages.stern.nyu.edu/~saral
> SSRN Page: http://ssrn.com/author=110270
> WIN Workshop: http://www.winworkshop.net
> Twitter: http://twitter.com/sinanaral
>
> On 4/12/2011 8:37 AM, Thomas Plotkowiak wrote:
>
> ***** To join INSNA, visit http://www.insna.org ***** Dear Members of the
> SocNet List,
>
> I am looking for any papers that have computed correlations or regressions
> of popular centrality network measures like closeness, degree, eigenvector
> or betweeness and the actual transmission of information.
>
> So for example I might have
>
> a) a network of friendships of peole and additionally
> b) I might have a network that has an arc if a person has forwarded
> information from a person.
>
> If I compute a network regression of the actors degree in the friendship
> network and the number of how often his information was forwarded I can see
> how useful the centrality measures actually are in predicting future
> information diffusion for an actor.
>
> I have tried that a couple of times on online friendship networks and the
> regression usually ends up having an explanation from common centrality
> measures are around 30%. I am wondering if there are similar attempts out
> there in order to compare my values and my approach?
>
> I think this question is highly relevant because it actually asks if the
> centrality measures we use every day to highlight certain actors in
> information diffusion are really usefull.
>
> P.S.
> I can also think of computing different measures for brokers between two
> communities and the actual transmission or strong ties and their influence
> on the actual transmission.
>
> Best Regards
> Thomas Plotkowiak
>
> --
> Thomas Plotkowiak
> Research Assistant
> MCM Institute
> St. Gallen, Switzerland
> Tel +41 71 224 27 47
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> is a service of INSNA, the professional association for social network
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-- 
--
Luca Rossi
LaRiCA - Advanced Communication Laboratory
Faculty of Sociology - "Carlo Bo" University, Urbino
[log in to unmask]
T. +39 0722 305726 F. +39 0722 305727
http://larica.uniurb.it/sigsna
http://larica.uniurb.it/redline

_____________________________________________________________________
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