[R] multinomial MCMCglmm

Vaniscotte Amélie
Tue, 09 Oct 2012 08:35:22 -0000

test1 <-

MCMCglmm(fixed=cbind(Apsy,Mygl,Crle,Crru,Miag,Miar,Mimi,Mumu,Misu,Soar,Somi,empty)~habitat,random=~mesh,family="multinomial12",data=metalSmA[,c(2,9,23:34)],rcov=~us(trait):units)



I got some error concerning the variance structure:

"ill-conditioned G/R structure: use proper priors if you haven't or

rescale data if you have"

I guess that the problem comes from the nature of my observations which
are frequencies instead of 0/1 per unit

Does someone know if a multinomial model fitted with MCMCglmm can handle
those frequencies table and how to specify the good G/R variance
structures?


Regards

Amélie Vaniscotte

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