This term adds one
network statistic to the model, equal to the number of nodes in the second
mode of the network with degree 2 or higher. The second mode of a bipartite
network object is sometimes known as the "event" mode.
Without the optional argument, this statistic is equivalent to b2mindegree(2).
# binary: b2concurrent(by=NULL)This optional argument specifie a vertex attribute (see Specifying Vertex attributes and Levels (?nodal_attributes) for details);
it functions just like the by argument of the b2degree term.
ergmTerm for index of model terms currently visible to the package.
ergm:::.formatTermKeywords("ergmTerm", "b2concurrent", "subsection")