drgeeData object.obeFit(object, ...)drgeeData object.geeFitobeFit performs outcome nuisance model based estimation
(as described in the man page for drgee)) given a
drgeeData object. The model is specified by variables y, a, x, ax, v
and as a character variable olink which are assumed to be
found in the input argument object as a drgeeData object.
Robust variance is calculated by robVcov.
obeFit is meant to be called by drgee.
drgeeData, drgee and robVcov.