R: Uniform homophily and differential homophily

nodematch-ergmTerm {ergm} | R Documentation

## 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` | quantitative attribute (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.

[Package ergm version 4.2.1 Index]