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Re: A few newbie questions

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Thu, 11 Aug 2005 14:30:37 -0700

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 ```***** To join INSNA, visit http://www.insna.org ***** Bart: Answers below: Bart Litjens wrote: >Overall I will manage to find my way with these measures, but 3 small questions remain, although they must be hiding somewhere in my recent pile of SNA manuals and literature: > >1) What is most meaningfull: compute the overall network density (Ucinet->Network->Network Properties->Density) based on symmetric or assymetric data? > > > I prefer density on the asymmetric data as that is what you have measured, no reason to symmetrize and impute data and then calculate a statistic based on imputed data. >2) Maybe another easy one: how do I in the end compare network density between 14 networks of DIFFERENT sizes? The networks are relatively small (mean = 25 actors), but some might consist out of 10, others 30. > > > Density controls for network size, but as Scott (2000) pointed out, all things being equal, larger networks will tend to have smaller densities given people's limited ability to know lots of people in a large network. >3) After I compute the In en Out degree centrality, I also compute the degree centrality based on symetric data. > >Now: I find that the mean degree centrality (symmetric data) in this case equals exactly the networks density (based on symmetric data). Are these two the same kind or is it coincidental? > > > They are measuring the same thing, the number of links in a network equals the sum of the individual links. - Tom >Thank you for any help offered! > >Bart Litjens >Michigan > >_____________________________________________________________________ >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. > > > -- To learn more about my evaluation book go to: http://www.oup-usa.org/isbn/0195141768.html My personal webpage: http://www-hsc.usc.edu/~tvalente/ --- Thomas W. Valente, PhD Director, Master of Public Health Program http://www.usc.edu/medicine/mph/ Department of Preventive Medicine School of Medicine University of Southern California 1000 S. Fremont Ave. Building A Room 5133 Alhambra CA 91803 phone: (626) 457-6678 fax: (626) 457-6699 email: [log in to unmask] _____________________________________________________________________ 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.```