View source: R/extend.x.formula.R

extend.x.formula | R Documentation |

extend a compact formula to all of it's terms as they are interpreted

extend.x.formula(formula, extend.term=TRUE, return.interaction=TRUE)

`formula` |
a model formula. |

`extend.term` |
logical. If |

`return.interaction` |
logical. Whether a list containing the new formula and a vector containing logical values with information about interactions should be returned or only the new formula. |

If `return.interaction`

is `TRUE`

a list containing the components:

`formula` |
the new formula. |

`is.interaction` |
logical, vector giving information whether the corresponding formula term is an interaction or not. |

Ulrike Naumann and David Warton <David.Warton@unsw.edu.au>.

`mvformula`

, `formulaUnimva`

, `plot.mvformula`

,
`best.r.sq`

.

data(spider) spiddat <- mvabund(spider$abund) X <- spider$x foo <- mvformula(spiddat~ X[,1]*X[,2]+log(X[,3])) extend.x.formula(foo)

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