Hi there,

I am trying to fit a random effects two-way linear model with unbalanced
data, and have two questions:

   1. Can someone verify that lmer() can indeed cope with an unbalanced
   table?
   2. This might be more difficult: I am looking to fit the same model with
   a KNOWN value for the error variance (sigma sq). I wonder if this is
   possible to do with current package, and if not, if it's a good idea to
   look into the implementation and try to do it myself. I'm curious to know
   how difficult that would be to a not-too-sophisticated R user.

Thanks so much,

Asaf

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