Nothing
## ----echo = FALSE, message = FALSE--------------------------------------------
require(jagsUI)
knitr::opts_chunk$set(
comment = "#",
error = FALSE,
tidy = FALSE,
cache = FALSE,
collapse = TRUE
)
## -----------------------------------------------------------------------------
library(jagsUI)
## -----------------------------------------------------------------------------
data(longley)
head(longley)
## -----------------------------------------------------------------------------
jags_data <- list(
gnp = longley$GNP,
employed = longley$Employed,
n = nrow(longley)
)
## -----------------------------------------------------------------------------
# Create a temporary file
modfile <- tempfile()
#Write model to file
writeLines("
model{
# Likelihood
for (i in 1:n){
# Model data
employed[i] ~ dnorm(mu[i], tau)
# Calculate linear predictor
mu[i] <- alpha + beta*gnp[i]
}
# Priors
alpha ~ dnorm(0, 0.00001)
beta ~ dnorm(0, 0.00001)
sigma ~ dunif(0,1000)
tau <- pow(sigma,-2)
}
", con=modfile)
## -----------------------------------------------------------------------------
inits <- function(){
list(alpha=rnorm(1,0,1),
beta=rnorm(1,0,1),
sigma=runif(1,0,3)
)
}
## -----------------------------------------------------------------------------
params <- c('alpha','beta','sigma')
## -----------------------------------------------------------------------------
out <- jags(data = jags_data,
inits = inits,
parameters.to.save = params,
model.file = modfile,
n.chains = 3,
n.adapt = 100,
n.iter = 1000,
n.burnin = 500,
n.thin = 2)
## ----eval=FALSE---------------------------------------------------------------
# out <- jags(data = jags_data,
# inits = inits,
# parameters.to.save = params,
# model.file = modfile,
# n.chains = 3,
# n.adapt = 100,
# n.iter = 1000,
# n.burnin = 500,
# n.thin = 2,
# parallel = TRUE)
## -----------------------------------------------------------------------------
out
## -----------------------------------------------------------------------------
names(out)
## -----------------------------------------------------------------------------
traceplot(out)
## -----------------------------------------------------------------------------
densityplot(out)
## -----------------------------------------------------------------------------
plot(out)
## -----------------------------------------------------------------------------
post_alpha <- out$sims.list$alpha
hist(post_alpha, xlab="Value", main = "alpha posterior")
## -----------------------------------------------------------------------------
# Now save mu also
params <- c(params, "mu")
out2 <- update(out, n.iter=300, parameters.to.save = params)
## -----------------------------------------------------------------------------
out2
## -----------------------------------------------------------------------------
whiskerplot(out2, 'mu')
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