[R-sig-ME] marginal R square calculation in zero truncated poisson model

[Stephanie Kalberer]

Dear Professor Bolker,
I am looking into life history data of sea lions at the moment and would like to test what influences the length of the inter-birth interval. My response variable shows a clear poisson distribution but as I don't have any zeros in my inter-birth interval, I use a zero truncated model. The full model:
glmmadmb(IBI..years.~ sex.first.offspring + SST.Jan.May. + IBI.of.previous.pup + birthyear_mother.num + birthyear_pup.num + first.offspring.of.interval.died.within.1st.year + (1|AnimalID), 
 family="truncpoiss", data=IBI_successive_pups_sexmat_OF_sex)
I couldn't find any information though how to calculate the marginal R square in that case, could you point me towards a document or solution for it?
Thanks a lot and best,
Stephanie Kalberer
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Stephanie Kalberer
PhD Candidate
Galapagos Sea Lion Project
Department of Animal Behaviour
Bielefeld University
Germany

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