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
formula that contains each term in
an object of class "
a vector or formula specifying which covariates are protected. Protected formulas appear in all subformulas.
an optional data frame (or object coercible by
Protected terms will appear in every subformula. If the supplied formula
includes the term
-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
object, its associated environment will be
NULL. All subformulas will inherit their
subformula returns a list of
1 2 3
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