Dear all (and especially Doug, Jarrod and Malcolm),

About a month ago, there was a really useful discussion between Doug, Jarrod
and Malcolm about fitting multiple membership models (
https://stat.ethz.ch/pipermail/r-sig-mixed-models/2011q2/006320.html).  I
was hoping that some of you could kindly offer some follow-up advice.

I am trying to implement something very similar to what was recommended in
that thread, but with the addition of covariates on both levels.  It's
pretty clear to me how to add covariates on level 1, but I do not quite
understand how to add covariates on level 2.  Could you please explain how
to do this?

Also, I have roughly 120 level-2 units, and 150,000 level-1 ones.  Some of
those level-1 units are members of almost all 120 level-2 units.  Should I
be worrying that the resulting model will be too large to estimate in
reasonable time (e.g., a day or two), or can these solutions handle it?

Thank you very much,
Andrei

-- 
Andrei Boutyline
University of California, Berkeley
PhD Student, Sociology
www.ocf.berkeley.edu/~andrei <http://www.ocf.berkeley.edu/%7Eandrei>

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