dyadcov-ergmTerm {ergm}

Dyadic covariate

Description

This term adds three statistics to the model, each equal to the sum of the covariate values for all dyads occupying one of the three possible non-empty dyad states (mutual, upper-triangular asymmetric, and lower-triangular asymmetric dyads, respectively), with the empty or null state serving as a reference category. If the network is undirected, x is either a matrix of edgewise covariates, or a network; if the latter, optional argument attrname provides the name of the edge attribute to use for edge values. This term adds one statistic to the model, equal to the sum of the covariate values for each edge appearing in the network. The edgecov and dyadcov terms are equivalent for undirected networks.

Usage

# binary: dyadcov(x, attrname=NULL)

Arguments

x, attrname

either a square matrix of covariates, one for each possible edge in the network, the name of a network attribute of covariates, or a network; if the latter, or if the network attribute named by x is itself a network, optional argument attrname provides the name of the quantitative edge attribute to use for covariate values (in this case, missing edges in x are assigned a covariate value of zero).

See Also

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

Keywords

directed, dyad-independent, quantitative dyadic attribute, undirected, binary