This term adds one statistic to the model, equal to the number of mixed
2-stars in the network, where a mixed 2-star is a pair of distinct edges
\((i{\rightarrow}j), (j{\rightarrow}k)\) . A mixed 2-star is
sometimes called a 2-path because it is a directed path of length 2 from
\(i\) to \(k\) via \(j\) . However, in the case of a 2-path the focus
is usually on the endpoints \(i\) and \(k\) , whereas for a mixed 2-star
the focus is usually on the midpoint \(j\) . This term can only be used
with directed networks; for undirected networks see kstar(2) . See
also twopath .
# binary: m2starergmTerm for index of model terms currently visible to the package.
ergm:::.formatTermKeywords("ergmTerm", "m2star", "subsection")