Multi-level (nested) correlation structures via geepack package

Hello,

I have a multi-level, cohort dataset with three levels: repeat measures of
a response (level 1), that are collected from individual participants
(level 2) who are students within a school (level 3). I would like to do a
generalized estimating equation (GEE) analysis of this clustered data, but
to do so I need to specify ?nested? correlation structures (e.g.
exchangeable, compound symmetric, Toeplitz) to account for the
within-individual and within-cluster correlations.

Here is a reference paper that describes a nested exchangeable correlation
structure and nested compound symmetry:
doi:10.1111/j.1541-0420.2009.01374.x.

The geepack is available in R to do GEE analyses, but it seems to me that
it only allows the user to specify a correlation structure via the
geepack(??corstr = ?) option which only accounts for the within-individual
correlations (that arise from repeated measures). Would it be possible to
specify the nested correlation structures that I refer to here to also
account for the within-cluster correlations using this package?

Thank you,

Edward


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