.extract.fd.formulae | R Documentation |

This function is used in `tergm.EGMME.initialfit`

and also when targets or monitoring
formulas are specified by characters. It makes a basic attempt to identify the
formation and dissolution formulas within a larger combined formula (which may also
include non-separable terms). Instances of `Form`

at the top level (which may occur
inside `offset`

) contribute to the formation formula; instances of `Persist`

and
`Diss`

at the top level (which may also occur inside `offset`

) contribute to the
dissolution formula. All other terms are regarded as non-separable; this includes instances
of `Form`

, `Persist`

, and `Diss`

that occur inside other operator terms,
including inside `Offset`

, and also includes all interactions at the top level (for which
the top level term is effectively the interaction operator `*`

or `:`

),
whether or not they include `Form`

, `Persist`

, and/or `Diss`

.
The formation and dissolution formulas are obtained by adding
the contributing terms, replacing `Form`

and `Persist`

with trivial operators that protect
the environments of their formula arguments but have no effect on statistics or coefficient names
(meaning the formulas effectively become cross-sectional), and replacing `Diss`

by a similar operator
that negates statistics. These are included in the return value as the `form`

and `pers`

elements of the list (the "dissolution" formula really being the persistence formula), which also includes
the formula of non-separable terms as `nonsep`

, and the formula of all terms after replacing
`Form`

, `Persist`

, and `Diss`

as described above as `all`

.

If usage proves problematic, one may specify the monitoring and/or targets formulas explicitly
(rather than by characters), and one may pass initial coefficient values for the EGMME to avoid
running `tergm.EGMME.initialfit`

.

```
.extract.fd.formulae(formula)
```

`formula` |
a |

A `list`

containing `form`

, `pers`

, `nonsep`

, and `all`

formulas as described above.

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.