Re: [R] glm - poisson

From: ronggui <0034058_at_fudan.edu.cn>
Date: Sat 19 Mar 2005 - 03:23:57 EST

i think that is ok.
"when a response count n(i) has index equal to t(i),the sample rate is n(i)/t(i),its expected value is u(i)/t(i)......a loglinear model for theexpeted rate has form log(u(i)/t(i))=a+bx"(agresti,2002) this model can use glm-poisson with a offset term to estimate

On Thu, 17 Mar 2005 15:22:02 -0800 (PST) Oli <olilili@yahoo.com> wrote:

> Hello,
>
> I have a question on glm - poisson. I would like to
> fit a model on proportion of counts with some factors,
> and I decided to use glm - poisson because count data
> is essentially related to poisson. However, since I
> need to deal with proportion, and glm - poisson does
> not allow non-integer responses, I am thinking of
> adding an offset term = log(total). Is it the right
> approach to it? or should I use quasi-poisson family,
> or should I even use weights?
>
> Thanks for your help!
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Mar 19 03:38:54 2005

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