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Thank you we are all excited to read it.

Sent from my iPhone

On Dec 12, 2009, at 12:49 PM, "Roger GuimerĂ "  
<[log in to unmask]> wrote:

> *****  To join INSNA, visit http://www.insna.org  *****
>
> Thank you, Barry, for writing about our work--this is flattering.
>
> Since the article has not appeared in PNAS yet (although it should  
> have)
> I am posting the link to a preprint, so that whatever discussion  
> ensues
> in the list is based on the science and not on the press release:
>
> http://amaral.chem-eng.northwestern.edu/publications/missing-and-spurious-interactions-and-reconstruction-complex-networks/
>
> Elisa: You are absolutely right--what we discuss (and, more  
> importantly,
> test) in the article is unbiased errors. We explicitly note this fact
> and, in the final discussion, briefly touch on how we think our  
> approach
> should be extended to correlated errors.
>
> Roger
>
> Bienenstock, Elisa wrote:
>> *****  To join INSNA, visit http://www.insna.org  *****
>>
>> Thank you!
>>
>> Very interesting, but I am confused about how to apply this type of  
>> approach when the data available is not only missing, but may be  
>> missing due to some systematic collection bias.
>>
>> -----Original Message-----
>> From: Social Networks Discussion Forum  
>> [mailto:[log in to unmask]] On Behalf Of Barry Wellman
>> Sent: Friday, December 11, 2009 6:27 PM
>> To: [log in to unmask]
>> Subject: [SOCNET] getting the "true" network
>>
>> *****  To join INSNA, visit http://www.insna.org  *****
>>
>> no theory needed
>>
>>
>> Barry Wellman
>> _______________________________________________________________________
 

>>
>>  S.D. Clark Professor of Sociology, FRSC               NetLab  
>> Director
>>  Department of Sociology                  725 Spadina Avenue, Room  
>> 388
>>  University of Toronto   Toronto Canada M5S 2J4    
>> twitter:barrywellman
>>  http://www.chass.utoronto.ca/~wellman             fax: 
>> +1-416-978-3963
>>  Updating history:      http://chass.utoronto.ca/oldnew/ 
>> cybertimes.php
>> _______________________________________________________________________
 

>>
>> Facebook (and Systems Biologists) Take Note: Network Analysis  
>> Reveals True
>> Connections
>> Northwestern University News Center (IL) (12/07/09) Fellman, Megan
>>
>> Northwestern University researchers Roger Guimera and Marta Sales- 
>> Pardo
>> have developed a universal method that can correctly analyze a  
>> variety of
>> complex networks.  The researchers tested their method on a range  
>> of five
>> networks: a karate club, a social network of dolphins, the neural  
>> network
>> of a worm, the air transportation network of Eastern Europe, and the
>> metabolic network of Escherichia coli.  For each of the five  
>> networks, the
>> researchers introduced errors and applied an algorithm to the  
>> distorted
>> network.  Each time, the algorithm created a new network with the  
>> errors
>> separated out, and each new network construction was closer to the
>> original true network.  "The flexibility of our approach, along  
>> with its
>> generality and its performance, will make it applicable to many areas
>> where network data reliability is a source of concern," say Guimera  
>> and
>> Sales-Pardo. The central idea to the new method is that, even  
>> though every
>> network has unique characteristics, they all have nodes that can be  
>> put
>> into specific groups, with the nodes connecting to each other based  
>> on
>> group membership.  The method averages all possible groupings of  
>> the nodes
>> and gives each group a weight that reflects its explanatory power.
>> "There are many ways to map nodes in a network, not just one," says
>> Sales-Pardo.  "We consider all the possible ways.  By taking the  
>> sum of
>> them all, we can identify both missing and spurious connections."
>>
>> http://www.northwestern.edu/newscenter/stories/2009/12/networks.html
>>
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>> _____________________________________________________________________
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>
> -- 
> Roger Guimera
> Chemical & Biological Engineering   Phone: +1-847-491-2778
> Northwestern University                    +1-847-467-1386
> 2145 Sheridan Road, Room E-136      Fax:   +1-847-491-3728
> Evanston, IL 60208, USA             http://amaral.northwestern.edu/roger
>
> _____________________________________________________________________
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