Re: [igraph] two-mode to one-mode with event types/attributes

[Moses Boudourides]

Hi Andrew,

Just a question about your example. What is the difference between
your event indexation and event time? I mean, is it possible for two
different events (not event types), say, events i and j to take place
at the same time, say, Tk?

In any case, one could see your example as a combination of three
different hypergraphs. In the first hypergraph, vertices are persons
and edges events. In the second hypergraph, vertices are events and
edges are event types. What I don't understand well (and for this
purpose I asked you the above question) is whether, in the third
hypergraph, vertices are events and edges are event times.

Now, what is nice with hypergraphs is that nested partitions (like the
previous ones) are additive and so your data can be first decomposed
in event attributes and subsequently projected on the set of vertices
(persons). This means that the resulting 2-mode network (between
persons) will be a multi-weighted graph, or better said, a graph
accepting vector weights, in which each component would correspond to
a different event attribute (two components in your case).

Best,

--Moses


On Mon, May 14, 2012 at 10:22 PM, Andrew Papachristos
<address@hidden> wrote:
> Greetings,
>
> I have one (I hope) easy question, and one may not be as easy.
>
> I have a large two-mode dataset (100,000s of cases) with multiple event
> types.  The data look something like so:
>
> Person  Event Event.Type Event.Time
> Andy 1 a T1
> Bob 2 a T2
> Cindy 3 b T3
> .....
>
> I'm trying to accomplish two things:
>
> 1. Figure out the easiest way to do a two-mode to one-mode conversion.
> Essentially, I'm looking to create a person-by-person network.
>
> 2. See if there is a way, when converting, to keep an event attribute (such
> as event type or time).
>
> Any direction is most welcome.
>
> Best,
> andrew
>
>
>
>
>
> Andrew V. Papachristos
> Robert Wood Johnson Health & Society Scholar ~ Harvard University
> Assistant Professor (on leave) ~ UMass, Amherst - Dept. of Sociology
> address@hidden
> www.papachristos.org
> (413) 545 - 0443
>
>
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