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Thanks! I'll look into the gamma centrality too.  Jordi

On Mon, Sep 28, 2015 at 3:30 PM, Zachary P Neal <[log in to unmask]> wrote:

> Hi Jordi,
>
> I've had students ask the same thing, and have been equally at a loss for
> an answer.  Looking for an out, in this paper (
> https://www.msu.edu/~zpneal/publications/neal-emporg.pdf) I proposed an
> alternative (I called it gamma-centrality) that yields qualitatively
> similar results and has a tunable parameter, but never yields negative
> scores.  As an added bonus, the "gamma" parameter doesn't have any
> restrictions on its range.
>
> Best,
> Zak
>
> --
> Zachary Neal, PhD
> Assistant Professor, Department of Psychology & Global Urban Studies
> Program
> Editor, Journal of Urban Affairs
> Michigan State University
> 316 Physics Road, Rm 262
> East Lansing, MI 48824
> http://www.msu.edu/~zpneal
> Twitter: @zpneal
>
> On networks - www.routledge.com/books/details/9780415881425/
> On system science - www.routledge.com/books/details/9780415843324/
> On public space - www.routledge.com/books/details/9780415997270/
> On diversity & cohesion - www.youtube.com/watch?v=Az6Uy7p3kas
>
>
> Quoting Jordi Comas <[log in to unmask]>:
>
> *****  To join INSNA, visit http://www.insna.org  *****
>>
>> So....
>>
>> I mistakenly told students to "play" with beta parameter of Bonacich
>> centrality.
>>
>> Student:"How can they be negative scores?'
>>
>> Me: "I don't know.  I'll get back to you.  But, we need to keep Beta below
>> the inverse of largest eignevalue.  Sorry about that.  Should have told
>> you
>> that."
>>
>> ?Inquisitive student: "I still don't understand how it can return negative
>> scores."?
>>
>> Me: "Not sure.  I'll get back to you on that.  Another cookie?"  (Ok,
>> Ididn't offer cookies).
>>
>> So, can someone help me out?  To my eyes, the Bonacich algoritihim sums up
>> the centrality score of each node by weighting each node.  How can and
>> additive series get a negative score?
>>
>> Thanks!
>>
>> Jordi
>> (cookies in the mail for you for good answer.  :) )
>>
>> --
>> *Jordi Comas*
>>
>>
>> *"There is nothing so practical as a good theory."  Kurt Lewin*
>> Social Innovation and Entrepreneurship Blog (under construction): Simple
>> Tools. <https://simpletools.blogs.bucknell.edu/>
>>
>> Netcentric <http://netcentric.blogs.bucknell.edu/>: Resources for
>> Teaching
>> Network Theory and Research
>>
>> Research and Writing Blog: Nets We Weave <
>> http://netsweweave.wordpress.com>
>>
>>
>>
>>
>>
>> *Assistant ProfessorSchool of ManagementBucknell UniversityTaylor 112570
>> 577 3161*
>>
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>
>
>


-- 
*Jordi Comas*


*"There is nothing so practical as a good theory."  Kurt Lewin*
Social Innovation and Entrepreneurship Blog (under construction): Simple
Tools. <https://simpletools.blogs.bucknell.edu/>

Netcentric <http://netcentric.blogs.bucknell.edu/>: Resources for Teaching
Network Theory and Research

Research and Writing Blog: Nets We Weave <http://netsweweave.wordpress.com>





*Assistant ProfessorSchool of ManagementBucknell UniversityTaylor 112570
577 3161*

_____________________________________________________________________
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
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