[R] Package for multiple membership model?

[Thomas Lumley]

On Tue, 3 Jan 2006, Brian Perron wrote:

> 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,

I think you want lmer() in the lme4 & Matrix packages. It allows crossed 
random effects.

 	-thomas