From: Troels Ring <tring_at_gvdnet.dk>

Date: Wed, 23 Jul 2008 23:49:35 +0200

sigma_dep ~ dunif(0,100)

for (j in 1:16) {

}",

file="ml3_pig.bug")

pigs3.inits <- function () {

}

Date: Wed, 23 Jul 2008 23:49:35 +0200

Dear friends - I'm on winXP, R 2.71 - I have with some help dveloped
this multivariate normal model, which gives very plausible results in
WinBUGS even without any

initial values specified. However, when I then try to run the same model
via the bugs function in R2WinBUGS with inits specified as inits=NULL
the program stops in a dead end. So I have tried to make inits for the
bugs function as shown below. But then WinBUGS come to a halt while
these inits are being handled so they are seemingly wrong. This is a bit
annoying and I would like to know how I managed to corrupt the inits.
This is sent both to WinBUGS and R with hope and some anxiety.
Best wishes

Troels

cat("

model {

for (i in 1:126) {

dep[i] ~ dnorm(mu.dep[i],tau.dep) mu.dep[i] <- alpha[ID[i]]*NAK.cor[i]+beta[ID[i]]*TBW.cor[i] fit[i] <- mu.dep[i]+CONST[i] } tau.dep <- pow(sigma_dep,-2)

sigma_dep ~ dunif(0,100)

for (j in 1:16) {

alpha[lev[j]] <- AB[lev[j],1] beta[lev[j]] <- AB[lev[j],2] AB[lev[j],1:2] ~ dmnorm(AB.hat[lev[j],],tau.AB[,])I(lower[], upper[]) AB.hat[lev[j],1] <- mu.alpha AB.hat[lev[j],2] <- mu.beta } lower[1] <- 0 lower[2] <- -100 upper[1] <- 100 upper[2] <- 0 mu.alpha ~ dnorm(0,0.0001) mu.beta ~ dnorm(0,0.0001)

tau.AB[1:2,1:2] <- inverse(sigma.AB[,])

sigma.AB[1,1] <- pow(sigma.alpha,2) sigma.alpha ~ dunif(0,100) sigma.AB[2,2] <- pow(sigma.beta,2) sigma.beta ~ dunif(0,100) sigma.AB[1,2] <- rho*sigma.alpha*sigma.beta sigma.AB[2,1] <- sigma.AB[1,2] rho ~ dunif(-1,1)

}",

file="ml3_pig.bug")

pigs3.inits <- function () {

list (AB=array(c(runif(16,0,10),runif(16,-30,0)),c(16,2)), mu.alpha=runif(1,0,10), mu.beta=runif(1,-30,0), sigma.dep=runif(1), sigma.alpha=runif(1), sigma.beta=runif(1),rho=runif(1))

}

pigs.parameters <- c ("mu.alpha", "mu.beta", "sigma_dep","alpha","beta", "fit","deviance","rho")

pigs3 <- bugs (ml_pig.data, debug=TRUE,inits=pigs3.inits, pigs.parameters, "ml3_pig.bug", n.iter=2000,n.chains=3, bugs.directory = bugs.directory)

-- Troels Ring - - Department of nephrology - - Aalborg Hospital 9100 Aalborg, Denmark - - +45 99326629 - - tring_at_gvdnet.dk ______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.Received on Wed 23 Jul 2008 - 21:52:55 GMT

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