Hi Tore,

I put my 2cents on Zuur et al 2009's book - Mixed effect models...
See Zero-Inflated examples in there.

cheers

milton

2010/2/1 Tore Chr Michaelsen <tore.michaelsen@bio.uib.no>

> Dear members;
>
> 1) I have fitted a glm to count data (using quasipoisson to correct for
> disp.). In the final model, the relationship between Res and Fitted (i.e.
> the line going through the plot) and QQ looks fine, but I am worried that
> low count (one to five) could violate some assumption of the glm/poisson:
> Although the line in the Res vs Fitted plot looks nice, the values show a
> clear pattern (five diagonal lines = the counts). Crawley/R book says it
> should look like the sky at night with no patterns. I assume patterns are
> not visible with large counts (e.g. 0-100), but highly visible with low
> counts as in this case. I still assume this is reason for some concern
> about
> the model, or is the concern not justified?
>
> 2) Any recommendations on literature regarding model inspection in R.
>
> Thank you for reading this mail!
>
> Best wishes;
> Tore
>
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