richard.cot...@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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