I just read a post by Andrew Dolman suggesting that a factor with only 3
levels should be treated as a fixed effect. This seems to be a perennial
question with mixed models. I'd really like to hear opinions from
several experts as to whether there is a consensus on the topic. It
really makes me uncomfortable that such an important modeling decision
is made with an "ad hoc" heuristic.

 

Thanks,

Mark Schultz, Ph.D.

Bedford VA Hospital

Bedford, Ma. 


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