[R] multiple values for a factor using nodematch in ergm()
Ben Mazzotta
benjamin.mazzotta at tufts.edu
Mon Aug 17 23:04:53 CEST 2009
Greetings, and many thanks for any insight you can offer.
I have a network object on which I'd like to simulate an ergm() using
{statnet}. Since the network object is large, I have not copied it here.
Each vertex has an attribute "language" which can take on integer values
greater than or equal to 1.
Is there a way to use the nodematch argument of ergm(), such that it
searches for any matches in the vertex attributes, rather than a 1-to-1
match?
For example, given
mat <- matrix(1, ncol=4, nrow=4)
net <- network(mat)
lang <- list("A", c("A","B"), "B", "C")
net %v% "languages" <- lang
The truth table for the matches should read
H T V (for head, tail, value)
1 2 1
1 3 1
1 4 0
2 3 1
2 4 0
3 4 0
This is the standard implementation of ergm(... , nodematch()), I believe.
model2 <- ergm(net ~ nodematch(languages))
In the course of writing this post, I discovered that the net %v%
"languages" command above coerces the list "lang" to a vector.
I also have a dataset that specifies exhaustively whether dyads share a
language or not; but I am not sure how to enter dyad information
directly into the ergm() function.
--
Ben Mazzotta
PhD Candidate
Fletcher School, Tufts University
160 Packard Ave, Medford MA 02155
benjamin.mazzotta at tufts.edu
+1.617.462.4486
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