data.frame from an mi Objectdata.frame. This function
removes the necessity for Zelig to depend on the
iterators package.NextFrame(obj, as.pair = FALSE)mi objectdata.frame as a list pairing the label and the
data objectdata.frame or NULL (if all
data.frames have been generated). If
as.pair is set to TRUE, then a list will be
returned, specifying the data.frame's label as
``label'' and the data.frame as ``data''