attrs is the rows of the mixing matrix and whose RHS
gives that for its columns (which may be different). A one-sided
formula (e.g., ~A ) is symmetrized (e.g., A~A ). A two-sided
formula with a dot on one side calculates the margins of the
mixing matrix, analogously to nodefactor , with A~.
calculating the row/sender/b1 margins and .~A calculating the
column/receiver/b2 margins. If row and column attributes are the
same and the network is undirected, only the cells at or above
the diagonal (where \(\text{row} \le \text{column}\)) will be calculated.
# binary: mm(attrs, levels=NULL, levels2=-1)# valued: mm(attrs, levels=NULL, levels2=-1, form="sum")
a two-sided formula whose LHS gives the attribute or
attribute function (see Specifying Vertex attributes and Levels (?nodal_attributes) for details.) for the rows of the mixing matrix and whose RHS gives
for its columns. A one-sided formula (e.g., ~A) is symmetrized (e.g., A~A)
subset of rows and columns to be used. (See Specifying Vertex
attributes and Levels (?nodal_attributes) for details.)
which specific cells of the matrix to include; ?nodal_attributes for details
how to aggregate tie values in a valued ERGM: "sum"
(the default) for a statistic of the form \(\sum_{i,j} x_{i,j}
y_{i,j}\), where \(y_{i,j}\) is
the value of dyad \((i,j)\) and \(x_{i,j}\) is the
term's covariate associated with it; and "nonzero" with the
edge considered to be present if its value is not 0. See
ergmTerm for more information.
ergmTerm for index of model terms currently visible to the package.
ergm:::.formatTermKeywords("ergmTerm", "mm", "subsection")