extend.x.formula: Extend a Formula to all of it's Terms

Description Usage Arguments Value Author(s) See Also Examples

Description

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

Usage

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

Arguments

formula

a model formula.

extend.term

logical. If TRUE terms that refer to multiple variables are split into it's multiple terms.

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.

Value

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.

Author(s)

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

See Also

mvformula, formulaUnimva, plot.mvformula, best.r.sq.

Examples

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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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