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On Thu, 18 Jan 2018, Sebastian Stevens wrote:
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> Dear Socnet colleagues,
>
>
>
> I have a query about multiplex ERGM¢s and I wonder if anyone can help me?
>
>
>
> I have two networks, one is a directed network of friendship ties where everyone in the network can send links. The
> second network is also a directed network, however only certain members of the network can send links. This second
> network is of individuals who nominate colleagues to provide them with feedback, however it is only individuals of a
> particular job role that can send these ties to nominate the colleagues.
>
>
>
> When using an ERGM, does it matter methodologically if ties can not be sent by all actors in the network?
Yes!
> If it does, is there any way of accounting for the inability of all
> actors not being able to send ties.
Yes! :) You do this by using the "constraints" argument in an ergm call.
You can see the possible constraint options in the help:
?`constraints-ergm`
Given the structure you're trying to constrain, I think the
contstraints=fixedas(present,absent) is probably what you'll want to
implement.
best,
Martina
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