See

 help(lmer, package="lme4")

for a mixed-effects model approach.  See

help(geeglm, package="geepack")

for a GEE approach.

-tgs

On Sat, May 1, 2010 at 1:52 PM, kende jan <kendejan@yahoo.fr> wrote:

> Hello
>
> I would like to perform with R, a binary logistic regression analysis
> taking account clustering
> (A randomized trial into 2 groups, patients within 50 hospitals):
> y (0,1)  is the outcome
> x1, x2 indivifdual’s characteristics
> x3,x4 hospitals’ characteristics.
>
> Thanks in advance
>
> Jan
>
>
>
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>
>
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