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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.
>Thank you for any help offered!
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Thomas W. Valente, PhD
Director, Master of Public Health Program
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phone: (626) 457-6678
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