[R-sig-ME] Beta-binomial distributions with lmer?

Ben Bolker bolker at ufl.edu
Wed Jun 10 15:18:21 CEST 2009

  No.  You can use a quasi-binomial model, although
the support is a little bit spotty (and beware that
quasi- models may falsely report inflation of the
random effects).

  Ben Bolker

Christine Griffiths wrote:
> Hi R users,
> Just a query as to whether lme4 can handle beta-binomial distributions as I 
> read that this was not available.
> If not, any suggestions on how to handle such a distribution to plot the 
> following model:
> y<-cbind(Biotic,Abiotic)
> m1<-lmer(y~Treatment+Month.rain+(1|Month)+(1|Block/EnclosureID/Quadrat))
> y referring to percentage cover of biotic matter.
> Cheers,
> Christine
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Ben Bolker
Associate professor, Biology Dep't, Univ. of Florida
bolker at ufl.edu / www.zoology.ufl.edu/bolker
GPG key: www.zoology.ufl.edu/bolker/benbolker-publickey.asc

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