Any dyad whose toggle would produce a nonzero change statistic
for a nodemix term with the same arguments will be fixed. Note
that the levels2 argument has a different default value for
blocks than it does for nodemix.
# blocks(attr=NULL, levels=NULL, levels2=FALSE, b1levels=NULL, b2levels=NULL)a vertex attribute specification (see Specifying Vertex attributes and Levels (?nodal_attributes) for details.)
control what mixing types are fixed.
levels2 applies to all networks; levels applies to unipartite networks;
b1levels and b2levels apply to bipartite networks (see Specifying Vertex
attributes and Levels (?nodal_attributes) for details)
ergmConstraint for index of constraints and hints currently visible to the package.
ergm:::.formatTermKeywords("ergmConstraint", "blocks", "subsection")