R: Factor attribute effect for the first mode in a bipartite...

b1factor-ergmTerm {ergm} | R Documentation

## Factor attribute effect for the first mode in a bipartite network

### Description

This term adds multiple network statistics to the model, one for each of (a subset of) the unique values of the `attr` attribute. Each of these statistics gives the number of times a node with that attribute in the first mode of the network appears in an edge. The first mode of a bipartite network object is sometimes known as the "actor" mode.

### Usage

    # binary: b1factor(attr, base=1, levels=-1)

    # valued: b1factor(attr, base=1, levels=-1, form="sum")

### Arguments

`attr` | quantitative attribute (see Specifying Vertex attributes and Levels (`?nodal_attributes`) for details.)
`base` | 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

To include all attribute values is usually not a good idea, because the sum of all such statistics equals the number of edges and hence a linear dependency would arise in any model also including `edges`. The default, `levels=-1`, is therefore to omit the first (in lexicographic order) attribute level. To include all levels, pass either `levels=TRUE` (i.e., keep all levels) or `levels=NULL` (i.e., do not filter levels).

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

This term can only be used with undirected bipartite networks.

### See Also

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

[Package ergm version 4.2.1 Index]