[R] unbiased sandwich variance estimator for GEE estimates

Qiong Yang qyang at bu.edu
Thu Mar 15 21:36:39 CET 2007


Hi,

Anyone knows any existing package/program that has implemented
unbiased (or bias-reduced) sandwich variance estimator (Wu (1986) and 
Carroll (2001)
for GEE estimates?

Thanks
Qiong



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