> I am having some problems using R with WinBUGS using the R2WinBUGS
> package. Specifically, when I try to run bugs() I get the following
> message.
>
> Error in FUN(X[[1L]], ...) :
> .C(..): 'type' must be "real" for this format
> >
>
> To give a little more context, my bugs() command (for a multilevel
> ordinal logit similar to Gelman and Hill, Data Analysis Using
> Regression and Multilevel/Hierarchical Models p. 383 is:
>
> Wednesbury.data <- list ("n.judge", "n", "n.cut", "y" "judge", "ct",
> "ra", "lg")
>
> Wednesbury.inits <- function(){
> list(C=matrix(0,39,2))
> }
> Wednesbury.parameters <- c("C", "b1", "b2", "b3")
Debugging your BUGS model or dataset via R is a bit of a pain. I find
that the best way (or maybe least worst way) to weed out the problems when
you get an error like this is to find the files (model/data/inits) that
R2WinBUGS has created and open them in WinBUGS itself. Run the Model
Specification tool and you can more easily determine which part of the
file the problem lies in.
Just looking at your Wednesbury.inits variable, you don't need to define
it as a function
Wednesbury.inits <- list(list(C=matrix(0,39,2)))
will do.
Also, I'm not sure if WinBUGS understands matrix data types (though I may
be wrong).
Regards,
Richie.
Mathematical Sciences Unit
HSL
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