Beta-binomial distributions with lmer?
Thanks. I was hoping for a miracle that this had been developed within the last couple of months. I am on the stats learning curve and am not quite sure how flexible to be with regards to distributions. Is quasibinomial acceptable, despite having data with a lot of 0s and a lot of 100s? Many thanks in advance, Christine
--On 10 June 2009 09:18 -0400 Ben Bolker <bolker at ufl.edu> wrote:
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