groupedData
object is at least a data.frame and a
display formula that provides a grouping structure. In the
nmGroupedData
class there are multiple level of grouping factors
and the response in the display formula is numeric. At present we
use old-style classes for groupedData
and the classes
that inherit from it."groupedData"
, directly.
Class "data.frame"
, by class "groupedData".
Class "oldClass"
, by class "groupedData".