istar-ergmTerm {ergm}

In-stars

Description

This term adds one network statistic to the model for each element in k . The i th such statistic counts the number of distinct k[i] -instars in the network, where a k -instar is defined to be a node N and a set of k different nodes \{O_1, \dots, O_k\} such that the ties (O_j{\rightarrow}N) exist for j=1, \dots, k . This term can only be used for directed networks; for undirected networks see kstar . Note that istar(1) is equal to both ostar(1) and edges .

Usage

# binary: istar(k, attr=NULL, levels=NULL)

Arguments

k

a vector of distinct integers

attr, levels

a vertex attribute specification; if attr is specified, then the count is over the instances where all nodes involved have the same value of the attribute. levels specified which values of attr are included in the count. (See Specifying Vertex attributes and Levels (?nodal_attributes) for details.)

See Also

ergmTerm for index of model terms currently visible to the package.

Keywords

categorical nodal attribute, directed, binary