[R] R2WinBUGS: Error in bugs(program="openbugs") but not openbugs()

Yuelin Li liy12 at mskcc.org
Thu Nov 11 17:48:32 CET 2010

I get an error when I call bugs(..., program="OpenBUGS",
bugs.directory="c:/Program Files/OpenBUGS/OpenBUGS312"),
expecting, as suggested in help(bugs), that it would fit the
model with openbugs() via BRugs.

 > help(bugs)
 ... either winbugs/WinBUGS or openbugs/OpenBUGS, the latter
 makes use of function openbugs and requires the CRAN package
 BRugs. ...

However, it works fine when I directly call openbugs().  All
other things are exactly the same.  It seems that (in my
settings) bugs(program="OpenBUGS") works differently than
openbugs().  Am I doing something wrong with bugs()?   Or
there is something wrong with my OpenBUGS installation?

I am using R-2.12.0, R2WinBUGS 2.1-16 (2009-11-06), OpenBUGS
3.1.2 rev 668 (2010-09-28), and BRugs 0.5-3 (2009-11-06)  on
a Windows XP machine.


------- R file ---------
# Example in Albert (2007).  Bayesian Computation with R.  Springer.
# pp. 237-238.  Prior = beta(0.5, 0.5), observe Binom(n, p) 
# y=7 successes out of a sample of n=50.  Estimate p.
y <- 7
n <- 50
alpha <- 1.0 
beta <- 1.0 
data <- list("y", "n", "alpha", "beta")
inits <- function() { list(p = runif(1)) }
param <- "p"
# this works
Albert.bugs <- openbugs(data=data, inits=inits, parameters.to.save=param, model.file = "C:/tryR/WinBUGS/Albert11.txt", n.chains=3, n.iter=500)
print(Albert.bugs, digits.summary = 4)
# this fails
Albert.bugs <- bugs(data=data, inits=inits, parameters.to.save=param, model.file="C:/tryR/WinBUGS/Albert11.txt", n.chains=3, n.iter=500, program="OpenBUGS")

------- BUGS file: Albert11.txt ------
y ~ dbin(p, n)
p ~ dbeta( alpha, beta )

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