[statnet_help] Constraints: blockdiag() and odegrees

[F Benjamin Rosche]

Dear statnet users,

I have a question regarding constraints in an ergm. To estimate
one model across a few networks (indexed by nid), I am using:

ergm(...., constraints=blockdiag("nid"))

to reflect that nodes in different networks cannot form edges between each
other.

For various reasons, I have to add another constraint: *+odegrees, *which
is currently not possible in combination with blockdiag().

I tried estimating separate models by network instead of using blockdiag()
so that I can add odegrees. However, because I have relatively many
parameters for relatively few observations per network, estimating just one
model across networks leads to much more stable estimates.

Is there any other strategy that I could take to estimate just one model
but enforce that nodes in different networks cannot form edges between each
other and have the same outdegree as the observed network?

I am grateful for any pointers you can provide.

Thank you,

Ben

-- 
*Benjamin Rosche *
Doctoral student / Social Dynamics Lab / benrosche.com
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