drop.scope compute those terms that can be
individually added to or dropped from a model while respecting the
hierarchy of terms.
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the terms or formula for the base model.
the terms or formula for the upper (
a list with one or both components
factor.scope is not intended to be called directly by users.
drop.scope a character vector of
terms labels. For
factor.scope, a list with components
add, character vectors of terms labels.
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