getGroupsFormula {nlme} | R Documentation |
The conditioning expression associated with formula(object)
(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)
object |
any object from which a formula can be extracted. |
asList |
an optional logical value. If TRUE the returned
value with be a list of formulas; else, if FALSE the returned
value will be a one-sided formula. Defaults to FALSE . |
sep |
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 formula(object)
a
NULL
value is returned.
Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu
getGroupsFormula.gls
,
getGroupsFormula.lmList
,
getGroupsFormula.lme
,
getGroupsFormula.reStruct
,
getGroups
getGroupsFormula(y ~ x | g1/g2)