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***** To join INSNA, visit http://www.insna.org ***** We have also relied on methods like the ones Tom Valente mentioned in many of our observational studies, and we summarize the pluses and minuses of this approach in a new paper here: http://jhfowler.ucsd.edu/examining_dynamic_social_networks.pdf I also in principle like the actor-oriented model approach of Siena, but in the past I could never get the model to converge for networks larger than 1000 nodes (this might be my own failing, though, as there is always a bit of art to getting models like that to work). We also have relied on experiments like this one in PNAS: http://jhfowler.ucsd.edu/cooperative_behavior_cascades.pdf and I am a big fan of David Nickerson's voter experiment and Sinan's new RCT. But I would resist abandoning evidence from observational studies. The resistance to observational studies reminds me of this Onion story: Multiple Stab Wounds May Be Harmful To Monkeys http://www.youtube.com/watch?v=S6CSIFi78Nw :) j James H. Fowler Professor of Medical Genetics and Political Science UC San Diego http://jhfowler.ucsd.edu CONNECTED http://connectedthebook.com _____________________________________________________________________ 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.