R2WinBUGS -警告消息

Question

我试着用这个例子来使用R2WinBUGS：

code

(请仅考虑以下部分：### 5.4。使用WinBUGS进行分析)

我收到以下错误消息：

Error in file(con, "wb") : cannot open the connection
In addition: Warning messages:
1: In file.create(to[okay]) :
  cannot create file 'c:/Program Files/WinBUGS14//System/Rsrc/Registry_Rsave.odc', reason 'Permission denied'
2: In file(con, "wb") :
  cannot open file 'c:/Program Files/WinBUGS14//System/Rsrc/Registry.odc': Permission denied
Warning message:
running command '"c:/Program Files/WinBUGS14//WinBUGS14.exe" /par "D:/R2WinBUGS/normal/script.txt"' had status 1 
> 

我不确定这对于正确的功能是否至关重要(其他一切看起来都很好)。有没有办法摆脱这个？

谢谢。

克里斯蒂安

PS：

这是R代码：

library(R2WinBUGS)
setwd("D:/R2WinBUGS/normal")

y10 <- rnorm(n = 10, mean = 600, sd = 30) # Sample of 10 birds
y1000 <- rnorm(n = 1000, mean = 600, sd = 30) # Sample of 1000 birds

# Save BUGS description of the model to working directory
sink("model.txt")
cat("
model {

# Priors
 population.mean ~ dunif(0,5000)        # Normal parameterized by precision
 precision <- 1 / population.variance   # Precision = 1/variance
 population.variance <- population.sd * population.sd
 population.sd ~ dunif(0,100)

# Likelihood
 for(i in 1:nobs){
    mass[i] ~ dnorm(population.mean, precision)
 }
}
",fill=TRUE)
sink()

# Package all the stuff to be handed over to WinBUGS
# Bundle data
win.data <- list(mass = y1000, nobs = length(y1000))

# Function to generate starting values
inits <- function()
  list (population.mean = rnorm(1,600), population.sd = runif(1, 1, 30))

# Parameters to be monitored (= to estimate)
params <- c("population.mean", "population.sd", "population.variance")

# MCMC settings
nc <- 3                 # Number of chains
ni <- 1000              # Number of draws from posterior (for each chain)
nb <- 1                 # Number of draws to discard as burn-in
nt <- 1                 # Thinning rate

# Start Gibbs sampler: Run model in WinBUGS and save results in object called out
out <- bugs(data = win.data, inits = inits, parameters.to.save = params, model.file = "model.txt", 
n.thin = nt, n.chains = nc, n.burnin = nb, n.iter = ni, debug = TRUE, DIC = TRUE, working.directory = getwd())

ls()

out                 # Produces a summary of the object

names(out)

str(out)

hist(out$summary[,8])           # Rhat values in the eighth column of the summary
which(out$summary[,8] > 1.1)        # None in this case

par(mfrow = c(3,1))
matplot(out$sims.array[1:999,1:3,1], type = "l")
matplot(out$sims.array[,,2] , type = "l")
matplot(out$sims.array[,,3] , type = "l")

par(mfrow = c(3,1))
matplot(out$sims.array[1:20,1:3,1], type = "l")
matplot(out$sims.array[1:20,,2] , type = "l")
matplot(out$sims.array[1:20,,3] , type = "l")

par(mfrow = c(3,1))
hist(out$sims.list$population.mean, col = "grey")
hist(out$sims.list$population.sd, col = "blue")
hist(out$sims.list$population.variance, col = "green")

par(mfrow = c(1,1))
plot(out$sims.list$population.mean, out$sims.list$population.sd)

pairs(cbind(out$sims.list$population.mean, out$sims.list$population.sd, out$sims.list$population.variance))

summary(out$sims.list$population.mean)
summary(out$sims.list$population.sd)
sd(out$sims.list$population.mean)
sd(out$sims.list$population.sd)

summary(lm(y1000 ~ 1))

Answer 1

可能是windows UAC故障。默认情况下，UAC不允许程序员写入除用户文件夹以外的任何内容。您可以通过以管理员身份运行R来更改这一点。但我认为这会改变库文件夹，除非它被硬编码到Renviron.site中(在R\etc文件夹中)，但我不是100%确定。

Answer 2

我能够通过定义"bugs.directory“来解决这个问题。

out <- bugs(data = win.data，inits = inits，parameters.to.save = params，model.file = "model.txt"，n.thin = nt，n.chains = nc，n.burnin = nb，n.iter = ni，debug = FALSE，DIC = TRUE，working.directory = getwd()，bugs.directory = 'c:/WinBUGS14')

Answer 3

你的链接指向一个巨大的文件，这个文件跨越了一本书的许多章节。在评论部分，它说：

# You may have to add a 'working.directory' argument to calls to
# the function bugs().

你做过了吗？还有一堆特定于用户的东西，比如：

setwd("C:/_Marc Kery/_WinBUGS book/Naked code") # May have to adapt that

您是否对这些项目进行了适当的修改？