No that would over parameritize my models as there are k^2 combinations. I
only want a marginal group effect in there, not all possible interactions.



On Thu, Jun 9, 2011 at 4:42 AM, Reinhold Kliegl
<reinhold.kliegl@gmail.com>wrote:

> Could you define your "groups" with class pairs as units?
> Reinhold Kliegl
>
> On Thu, Jun 9, 2011 at 5:39 AM, Jeroen Ooms <jeroen.ooms@stat.ucla.edu>
> wrote:
> > The standard assumption in multilevel modelling seems to be that every
> > observation is in 1 group. However, I have an application in which every
> > observation is in 2 (exchangable) groups. More precisely, I have k groups
> > and k^2 observations, and there is one observations for every combination
> of
> > groups. The groups are unordered, so I can't do e.g. 1 + (1| firstgroup)
> +
> > (1|secondgroup). Is there a way to model this with lme4?
> >
> > So the schoolbook example would be a hierarchical model with children
> within
> > classes, however every child is in two classes at the same time.
> >
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> >
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> >
>

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