The conditioning expression associated with
(i.e. the expression after the
| operator) is returned either as
a named list of one-sided formulas, or a single one-sided formula,
depending on the value of
asList. The components of the
returned list are ordered from outermost to innermost level and are
named after the grouping factor expression.
getGroupsFormula(object, asList, sep)
any object from which a formula can be extracted.
an optional logical value. If
character, the separator to use between group levels when
multiple levels are collapsed. The default is
a one-sided formula, or a list of one-sided formulas, with the
grouping structure associated with
formula(object). If no
conditioning expression is present in
NULL value is returned.
José Pinheiro and Douglas Bates [email protected]
getGroupsFormula(y ~ x | g1/g2)
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