jags_qrjm.weib.sharedRE.IG <-
function (...) {
# constants
c1 <- (1-2*tau)/(tau*(1-tau))
c2 <- 2/(tau*(1-tau))
# likelihood
for (i in 1:I){
# longitudinal part
for(j in offset[i]:(offset[i+1]-1)){
y[j] ~ dnorm(mu[j], prec[j])
va1[j] ~ dexp(1/sigma)
prec[j] <- 1/(sigma*c2*va1[j])
mu[j] <- inprod(beta[1:ncX], X[j, 1:ncX]) + inprod(b[i, 1:ncU], U[j, 1:ncU]) + c1*va1[j]
}#end of j loop
# random effects
for(r in 1:ncU){
b[i,r] ~ dnorm(0, prec.Sigma2[r])
}
# survival part
etaBaseline[i] <- inprod(alpha[1:ncZ], Z[i, 1:ncZ]) + inprod(alpha.assoc[1:ncU], b[i, 1:ncU])
log_S1[i] <- -exp(etaBaseline[i]) * pow(Time[i], shape)
log_h1[i] <- log(shape) + (shape-1)*log(Time[i]) + etaBaseline[i]
logL[i] <- event[i]*log_h1[i] + log_S1[i]
mlogL[i] <- -logL[i] + C
zeros[i] ~ dpois(mlogL[i])
}#end of i loop
# priors for longitudinal parameters
for(rr in 1:ncU){
prec.Sigma2[rr] ~ dgamma(priorA.Sigma2, priorB.Sigma2)
covariance.b[rr] <- 1/prec.Sigma2[rr]
}
beta[1:ncX] ~ dmnorm(priorMean.beta[], priorTau.beta[, ])
sigma ~ dgamma(priorA.sigma, priorB.sigma)
# priors for survival parameters
alpha[1:ncZ] ~ dmnorm(priorMean.alpha[], priorTau.alpha[, ])
shape ~ dgamma(priorA.shape, priorB.shape)
for(rr in 1:ncU){
alpha.assoc[rr] ~ dnorm(0, priorTau.alphaA)
}
}
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