Formula manipulation {MuMIn}

Manipulate model formulas

Description

simplify.formula rewrites a formula into shorthand notation. Currently only the factor crossing operator * is applied, so an expanded expression such as a+b+a:b becomes a*b. expand.formula does the opposite, additionally expanding other expressions, i.e. all nesting (/), grouping and ^.

Usage

simplify.formula(x)
expand.formula(x)

Arguments

x

a formula or an object from which it can be extracted (such as a fitted model object).

Author(s)

Kamil Bartoń

See Also

formula

delete.response, drop.terms, and reformulate

Examples

simplify.formula(y ~ a + b + a:b + (c + b)^2)
simplify.formula(y ~ a + b + a:b + 0)

expand.formula(~ a * b)