[R] GLM quasipoisson error
highstat at highstat.com
Tue Oct 6 17:02:10 CEST 2009
> I'm having an error when trying to fit the next GLM:
>>>model<-glm(response ~ CLONE_M + CLONE_F + HATCHING
> +(CLONE_M*CLONE_F) + (CLONE_M*HATCHING) + (CLONE_F*HATCHING) +
> (CLONE_M*CLONE_F*HATCHING), family=quasipoisson)
>>> anova(model, test="Chi")
> I guess that those variables are factors, and that you have empty
> combinations? Make a coplot, and see whether you have data for all
> combinations of the levels of your factors. Formulated differently..does
> it make sense, or is it possible to fit the 3-way interaction for your
> Also..you may want to use the str command to see whether "response" is
> indeed coded correctly.
>>Error in if (dispersion == 1) Inf else object$df.residual :
> missing value where TRUE/FALSE needed
> If I fit the same model by using the Poisson distribution, it works.
> I have not a clue about where the problem could be. Do you have any
> idea or suggestion I could try?
> Thank you in advance,
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
Dr. Alain F. Zuur
First author of:
1. Analysing Ecological Data (2007).
Zuur, AF, Ieno, EN and Smith, GM. Springer. 680 p.
2. Mixed effects models and extensions in ecology with R. (2009).
Zuur, AF, Ieno, EN, Walker, N, Saveliev, AA, and Smith, GM. Springer.
3. A Beginner's Guide to R (2009).
Zuur, AF, Ieno, EN, Meesters, EHWG. Springer
Statistical consultancy, courses, data analysis and software
Highland Statistics Ltd.
6 Laverock road
UK - AB41 6FN Newburgh
Email: highstat at highstat.com
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