[R-sig-ME] log of offset for Poisson?

Ben Bolker bbolker at gmail.com
Fri Apr 22 02:32:26 CEST 2011

On 11-04-21 08:25 PM, benton at stat.berkeley.edu wrote:
> Hi:
> I am pretty sure that I need to take the log of the offset variable when
> fitting a Poisson model using glmer, but I was hoping someone might be
> kind enough to confirm this.
> Thanks,

  Yes.  Offsets are added on the scale of the linear predictor.

  When in doubt about this sort of thing, make up a little simulated
example for yourself and see whether you recover the right answer.

  Ben Bolker

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