nodematch-ergmTerm-b316dba4: Uniform homophily and differential homophily

In ergm: Fit, Simulate and Diagnose Exponential-Family Models for Networks

Uniform homophily and differential homophily

Description

When diff=FALSE , this term adds one network statistic to the model, which counts the number of edges (i,j) for which attr(i)==attr(j) . This is also called “uniform homophily”, because each group is assumed to have the same propensity for within-group ties. When multiple attribute names are given, the statistic counts only ties for which all of the attributes match. When diff=TRUE , p network statistics are added to the model, where p is the number of unique values of the attr attribute. The k th such statistic counts the number of edges (i,j) for which ⁠attr(i) == attr(j) == value(k)⁠ , where value(k) is the k th smallest unique value of the attr attribute. This is also called “differential homophily”, because each group is allowed to have a unique propensity for within-group ties. Note that a statistical test of uniform vs. differential homophily should be conducted using the ANOVA function.

By default, matches on all levels k are counted. This works for both diff=TRUE and diff=FALSE .

Usage

# binary: nodematch(attr, diff=FALSE, keep=NULL, levels=NULL)

# valued: nodematch(attr, diff=FALSE, keep=NULL, levels=NULL, form="sum")

# valued: match(attr, diff=FALSE, keep=NULL, levels=NULL, form="sum")

Arguments

attr	a vertex attribute specification (see Specifying Vertex attributes and Levels (?nodal_attributes) for details.)
diff	specify if the term has uniform or differential homophily
keep	deprecated
levels	this optional argument controls which levels of the attribute attributes and Levels (?nodal_attributes) for details.)
form	character how to aggregate tie values in a valued ERGM

Note

The argument keep is retained for backwards compatibility and may be removed in a future version. When both keep and levels are passed, levels overrides keep.

See Also

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

\Sexpr[results=rd,stage=render]{ergm:::.formatTermKeywords("ergmTerm", "nodematch", "subsection")}

ergm documentation built on Oct. 7, 2024, 5:08 p.m.