nodeifactor-ergmTerm | R Documentation |

This term adds multiple network
statistics to the model, one for each of (a subset of) the unique
values of the `attr`

attribute (or each combination of the
attributes given). Each of these statistics gives the number of
times a node with that attribute or those attributes appears as the
terminal node of a directed tie.

For an analogous term for quantitative vertex attributes, see `nodeicov`

.

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

`attr` |
quantitative attribute (see Specifying Vertex attributes and Levels ( |

`base` |
deprecated |

`levels` |
this optional argument controls which levels of the attribute
attributes and Levels ( |

`form` |
character how to aggregate tie values in a valued ERGM |

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`

.

`ergmTerm`

for index of model terms currently visible to the package.

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