Hi Chuck!

Actually my data has a lot of zeros because I counted the number of species
that is exclusive to each studied fragment. So, my response variable is the
number of exclusive species. That's why it has a lot of zeros. I have
fragments that do not present exclusive species.

Thank's for your help!

2012/3/27 chuck.01 <CharlieTheBrown77@gmail.com>

> Could you please post a small example of your data and code which gives you
> this error.  Your assumed error distribution sounds reasonable.  I am
> interested as to why you have zeros... you have sites with species richness
> ==0 ??
>
>
>
> Lívia Dorneles Audino wrote
> >
> > I'm trying to make a glmm to identify the relationship between insect
> > species richness with fragment size, isolation and time (different
> years).
> > I already tried to analyse it using poisson distribution error, but I
> > always face with the following warning:
> > *glm.fit: fitted probabilities numerically 0 or 1 occurred *
> >
> > This is probably hapenning because my dataset has a lot of zeros. So,
> what
> > error distribution should I use?
> >
> > --
> > *Lívia *
> >
> >       [[alternative HTML version deleted]]
> >
> >
> > ______________________________________________
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> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>
> --
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> ______________________________________________
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>



-- 
*Lívia Dorneles Audino*
Doutoranda em Entomologia
Laboratório de Ecologia e Conservação de Invertebrados
Universidade Federal de Lavras

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