Message-ID: <4DB0CC9A.8070606@gmail.com>
Date: 2011-04-22T00:32:26Z
From: Ben Bolker
Subject: log of offset for Poisson?
In-Reply-To: <2bc56b09e11fb32036d02dcee92d36d4.squirrel@www.stat.berkeley.edu>
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