
   Thanks. Please try this:

   http://www.megaupload.com/?d=GJDWP7ZO

   




________________________________
De: Roman Luštrik <roman.lustrik@gmail.com>

Enviado: mié,22 junio, 2011 20:51
Asunto: Re: [R-sig-ME] Count data

I don't think attachments are coming through. Maybe upload them to an online 
hosting service or maybe a Public dropbox folder.

Cheers,
Roman



ote:


>  Sorry, this is the correct file attached.
>
>
>
>
>________________________________

>Para: r-sig-mixed-models@r-project.org
>Enviado: mié,22 junio, 2011 20:43
>Asunto: [R-sig-ME] Count data
>
>
>  Dear list:
>
>  This may be quite a naive question: I am fitting a model in which the
>response variable is the number of chicks hatched in nests of different pairs 
of
>
>swallows. I assumed that this is count data, so I used family=poisson for the
>model. But when fitting the residuals vs. fitted values, I cannot see the
>structure that I've been told count data normally has. Also, amount of variance
>explained by random effects when assuming count data is this:
>
>  Random effects:
>Groups    Name        Variance   Std.Dev.
>pair:site (Intercept) 2.0757e-02 1.4407e-01
>site      (Intercept) 6.8285e-17 8.2635e-09
>year      (Intercept) 2.5513e-03 5.0511e-02
>
>
>  Whereas if I assume gaussian errors, I get this:
>
>  Random effects:
>Groups    Name        Variance Std.Dev.
>pair:site (Intercept) 4.89955  2.21349
>site      (Intercept) 0.45493  0.67448
>year      (Intercept) 0.22061  0.46969
>Residual              0.80047  0.89469
>
>  I don't know if this is indicative of anything, but I'm concerned I may be
>making the wrong assumptions. Graph of residuals vs fitted is attached.
>
>  Thank you very much
>
>  ________________________________________
>
>  Iker Vaquero-Alba
>  Centre for Ecology and Conservation
>  Daphne du Maurier Building
>  University of Exeter, Cornwall Campus
>  Treliever Road
>  TR10 9EZ Penryn
>  U.K.
>
> http://biosciences.exeter.ac.uk/cec/staff/postgradresearch/ikervaquero-alba/
>_______________________________________________
>R-sig-mixed-models@r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models
>
>


-- 
In God we trust, all others bring data.

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