[R] random effects mixed model, different regressors

From: Fensis <mirresimons_at_gmail.com>
Date: Thu, 31 Jul 2008 02:31:26 -0700 (PDT)

Hi everybody,

I have built a model that includes subject ID as a random effect, and has a continous variable (time) and I want to test whether the slope of this line differs between treatments (this is tested with the interaction between treatment and "time").

My question now is that I also want to include regressors that might explain variation in this slope between subjects (and of which I have this one estimate for the whole time period). How do I do this? If I just code it as the same number for all the time points I have measured I am overestimating my sample size don't I? (because I have not measured it for each time point).

I am curious as to what you think about this

Thank you very much

Greetz

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