Description Usage Arguments Details Value Examples
A formula sub
is a subformula of formula
if (i) all the terms
on the right hand side of sub
are terms of formula
and (ii)
their left hand sides are identical. subformula
finds every
subformula of formula
that contains each term in protected
.
1  subformula(formula, protected = NULL, data = NULL)

formula 
an object of class " 
protected 
a vector or formula specifying which covariates are protected. Protected formulas appear in all subformulas. 
data 
an optional data frame (or object coercible by

Protected terms will appear in every subformula. If the supplied formula
includes the term 0
or 1
, none of the subformulas will
include the intercept. Otherwise, the intercept will be interpreted as
being protected. If formula
is is coerced to a formula
object, its associated environment will be
NULL
. All subformulas will inherit their .Environment
attribute from formula
.
subformula
returns a list of formula
objects.
1 2 3  subformula(z ~ x + y)
subformula(y ~ x + y + y^2, protected = ~ x)
subformula(y ~ x + y + t + I(t^2), protected = c("x","I(t^2)"))

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