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At the risk of tooting my own horn, let me draw your attention to the
following paper, where this question is discussed:

  Mixing patterns in networks, M. E. J. Newman, Phys. Rev. E 67, 026126

You can also find a copy here:

There have certainly also been other earlier discussions of the issue,
particularly in the epidemiology literature, some of which are cited in the


On Tuesday 02 May 2006 05:02, Dr. Timothy R. Huerta wrote:
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> Hello all!
> Great Sunbelt. Nice seeing a bunch of you.
> I was wondering if there was a metric that one could use to express the
> degree to which relationships among categories of nodes are equally
> distributed. For example, I have a network of 12 people, 4 short, 4 medium
> and 4 tall. I want to know if participants in the network discriminate in
> the creation of ties by category.
> I have an idea in mind, but I don't want to reinvent the wheel here.
> Tim Huerta

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