Commonly used ERGM terms

For full list of the terms available in the ergm package, in R type: help("ergm-terms")

Name	Unit of counting	Description	Num. of statistics	Dep/ind	Dir/undir	Unip/bip
edges	edges	number of edges	1	ind	both	both
nodefactor	units of the attribute	number of times that nodes with a given level of a categorical nodal attribute appear within the edgeset	1 per level of attribute included	ind	both	both
nodematch	edges	number of edges whose incident nodes match on value of nodal attribute	if diff=F, 1; if diff=T, 1 per level of attribute included	ind	both	both
nodemix	edges	number of edges whose incident nodes fall into each combination of values for a nodal attribute	1 per combo of attribute included	ind	both	both
nodecov	units of the attribute	the sum of a nodal attribute value for the incident nodes of an edge, summed across all edges	1	ind	both	both
absdiff	units of the attribute	the absolute difference in a nodal attribute between incident nodes for an edge, summed across all edges	1	ind	both	both
mutual	dyad	number of mutual edges (a->b and b->a)	1	dep	dir	both
degree	node	number of nodes of degree x	1 per each value of x included	dep	undir	unip
idegree	node	number of nodes of in-degree x	1 per each value of x included	dep	dir	unip
odegree	node	number of nodes of out-degree x	1 per each value of x included	dep	dir	unip
b1degree	node	number of mode 1 nodes of degree x	1 per each value of x included	dep	undir	bip
b2degree	node	number of mode 2 nodes of degree x	1 per each value of x included	dep	undir	bip
mindegree	node	number of nodes of at least degree x	1 per each value of x included	dep	undir	unip
triangles	triangles	number of triangles	1 (more if attributes used)	dep	undir	unip
gwesp	complex	geometrically weighted edgewise shared partners	1	dep	both	unip

Notes:

• Dep/indep = A term involving statistical dependence or independence among relations

• Dir/undir = works for directed and/or indirected networks

• Unip/bip = works for unipartite and.or bipartite networks