library(doMC)
library(babar)
library(bayes705)
# Di ~ Gamma(kappa, lambda) # likelihood
# kappa ~ Uniform(0, 25) # kappa prior
# lambda ~ Uniform(1e-3, 1) # lambda prior
# Data sets:
DA <- c(52, 49, 59, 29, 39, 11, 41)
DB <- c(32, 20, 7, 12, 30, 17, 10, 32, 29, 39, 11, 41)
DC <- c(3, 29, 20, 7, 12, 30, 17, 10, 32, 29, 39, 11, 9, 32)
DD <- DA
# Prior specifications:
transform <- function(params) {
tParams = numeric(length=length(params))
tParams[1] = UniformPrior(params[1], 0, 25) # prior on kappa
tParams[2] = UniformPrior(params[2], 1e-3, 1) # prior on lambda
return(tParams)
}
# Log-likelihood
llf <- function(params) {
tParams = transform(params)
kappa = tParams[1]
lambda = tParams[2]
n <- length(DD)
#\kappa \log(\lambda) - \log(\Gamma(\kappa)) + \sum_{i=1}^n(\kappa-1)\log(D_i) - \lambda D_i
ll <- n*kappa*log(lambda) - n*log(gamma(kappa)) + (kappa-1)*sum(log(DD)) - lambda*sum(DD)
return(ll)
}
prior.size <- 50
tol <- 0.005
log(tol)
getDoParWorkers()
registerDoMC(8)
getDoParWorkers()
fv.mat<-NULL
num.rep <- 1000
t1<-Sys.time()
fv.mat <- foreach(i=1:num.rep, .combine="c") %dopar% {
nestedSampling(llf, numberOfParameters = 2, prior.size, transform, tolerance=tol)$logevidence
}
t2<-Sys.time()
difftime(t2,t1)
hist(fv.mat)
mean(fv.mat)
median(fv.mat)
sd(fv.mat)
# > mean(fv.mat)
# [1] -34.01794
# > median(fv.mat)
# [1] -34.02146
# > sd(fv.mat)
# [1] 0.2481248
# >
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