Dear R-User,
I have written a simple code to analyze some data using Bayesian logistic
regression via the R2WinBUGS package. The code when run in WinBUGS stops
WinBUGS from running it and using the package returns no results also.
I attach herewith, the code and a sample of the dataset.
Any suggestion will be greatly appreciated.
Chris Guure
Biostatistics Department
University of Ghana
library(R2WinBUGS)
library(coda)model1<-function(){
for (i in 1:N) {
# likelihood function
ms[i] ~ dbin( p [ i ], N )
logit(p [ i ] ) <- alpha + bage*age[ i ] + bpam*pam[i ] + bpah*pah[i]
}
### prior for intercept
alpha ~ dnorm(0,0.0001)
# prior for slopes
bage ~ dnorm(0,0.0001)
bpam ~ dnorm(0,0.0001)
bpah ~ dnorm(0,0.0001)
# OR for alpha
or.age<-exp(bage)
# OR for hbp
or.pam <- exp(bpam)
# OR for fdm
or.pah <- exp(bpah)
}
data=cbind(ms=c(0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0),
age=c(77, 83, 75, 78, 75, 83, 85, 80, 80, 85, 76, 77, 80, 76, 88, 77, 81, 78,
85, 81),
pam=c(0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1),
pah=c(1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0))
N=20
#### initial values
###
lineinits <- function(){
list(alpha=1,bage= 0.05, bpam=0.05, bpah=0.05)
}
## CODA output
lineout1 <- bugs(data, lineinits, c("bage", "alpha","bpam", "bpah", "or.age",
"or.pam", "or.pah"), model1,n.iter = 11000, n.burnin = 1000, n.chains = 2,
codaPkg = T, DIC = TRUE)
### Posterior summaries
line.coda <- read.bugs(lineout1)
summary(line.coda)
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