This term adds one statistic to the model, equal to the number of cross-layer two-stars or two-paths in the network.
# binary: twostarL(Ls, type, distinct=TRUE)a list (constructed by list() or c() of two Layer Logic specifications (c.f. Layer Logic section in the Layer() documentation) specifying the layers of interest.
determines what is counted:
"any" Number of configurations
\((i-j), (i-k)\) , where
\((i-j)\) is in logical layer Ls[[1]]
and \((i-k)\) is in logical layer Ls[[2]] .
"out" Number of configurations
\((i{\rightarrow}j), (i{\rightarrow}k)\), where
\((i{\rightarrow}j)\) is in logical layer Ls[[1]]
and \((i{\rightarrow}k)\) is in logical layer Ls[[2]].
"in" Number of configurations
\((j{\rightarrow}i), (k{\rightarrow}i)\), where
\((j{\rightarrow}i)\) is in logical layer Ls[[1]]
and \((k{\rightarrow}i)\) is in logical layer Ls[[2]].
"path" Number of configurations
\((j{\rightarrow}i), (i{\rightarrow}k)\), where
\((j{\rightarrow}i)\) is in logical layer Ls[[1]]
and \((i{\rightarrow}k)\) is in logical layer Ls[[2]].
At this time, "any" is only supported for undirected networks, and if the network is undirected, type is ignored and "any" is assumed.
if TRUE, \(j\) and \(k\) above are required to
be distinct. That is, the constituent edges may not be coincident or
reciprocal.
ergmTerm for index of model terms currently visible to the package.
ergm:::.formatTermKeywords("ergmTerm", "twostarL", "subsection")