Is there a R package that use sampling weights in multilevel modeling? The survey package does not handle multilevel modeling and the weight option in lmer and nlmer functions from lme4 (used for multilevel modeling) is for weighted least squares estimation. 
Suggestion from one with experience in this subjet (including creating weights from strata and sampling unit variables) will be helpful. For example if analyzing data clustered in schools, how to use student's sampling weight or school sampling weight or both? 


Peter Maclean
Department of Economics
UDSM
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