WinBUGS with R

Richard.Cotton at hsl.gov.uk wrote:

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))
       }

Untested, but I think it needs to be

 Wednesbury.inits <- function(){
       matrix(0,39,2)
 }

and a function is of interest if some randomness should be in the inits...

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.

Yes.

Also, I'm not sure if WinBUGS understands matrix data types (though I 
may be wrong).

It does.


Uwe

Regards,
Richie.

Mathematical Sciences Unit
HSL


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