Hello all:  
 
I am interested in computing what the multilevel modeling literature calls a multiple membership model.  More specifically, I am working with a data set involving clients and providers.  The clients are the lower-level units who are nested within providers (higher-level).  However, this is not nesting in the usual sense, as clients can belong to multple providers, which I understand makes this a "multiple membership model."  Right now, I would like to keep this simple, using only a continuous dependent variable, but would like to also extend this to a repeated measures design.  This doesn't seem to be possible with the lme package.  Is there something else I could consider?  
Thanks,
Brian
 

NIMH Training Fellow
GWB School of Social Work, PhD Program
Washington University in St. Louis
One Brookings Drive
St. Louis, MO  63130

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