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    $\begingroup$ is right that this doesn't seem to make much sense in a linear setting, but it can be very useful in Poisson regression. I'll see if I can track down a link to something Ben Bolker said on the subject (he's one of the developers of lme4, along with Doug Bates). $\endgroup$ Commented Jul 24, 2013 at 21:33
  • $\begingroup$ Yeah, as I said probably I am biased thinking about LMM's mostly and I was commenting on the "conceptual part". I explained why this works in the case of glmer anyway though (despite not being overly happy with it). $\endgroup$ Commented Jul 24, 2013 at 21:59