This term adds one
network statistic to the model for each element in d
; the \(i\) th
such statistic equals the number of nodes in the network of degree
d[i]
, i.e. with exactly d[i]
edges.
This term can only be used with undirected networks; for directed networks
see idegree
and odegree
.
# binary: degree(d, by=NULL, homophily=FALSE, levels=NULL)
vector of distinct integers
the optional argument by
specifies a vertex attribute (see Specifying
Vertex attributes and Levels (?nodal_attributes
) for details).
If this is specified and homophily
is TRUE
,
then degrees are calculated using the subnetwork consisting of only
edges whose endpoints have the same value of the by
attribute.
If by
is specified and
homophily
is FALSE
(the default), then separate degree range
statistics are calculated for nodes having each separate
value of the attribute. levels
selects which levels of by` to include.
ergmTerm
for index of model terms currently visible to the package.
ergm:::.formatTermKeywords("ergmTerm", "degree", "subsection")