Created
April 12, 2017 10:18
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Reproduce de Schoot et al. (2014) Bayesian Analysis
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## Model from appendix 3 | |
``` | |
model{ | |
# There are 20 individuals. | |
for (i in 1:n) { | |
# The dependent variable has a mean (beta) and prior precision (tau). | |
y[i] ~ dnorm(beta[i], tau) | |
# Beta consists of an intercept: mu (which is, without any predictors in the model equal to the mean of our dependent variable) | |
beta[i] <- mu [i]} | |
# Mu (=mean of dependent variable) has a normal prior distribution with a mean of 80 and a prior precision of .01 and the prior is limited to obtain scores between 40 and 180. The prior precision of the dependent variable, tau, has a inverse gamma prior distribution. | |
mu ~ dnorm(80,.01) | |
#(40,180) | |
tau ~ dgamma(0.01, 0.01) | |
} | |
``` | |
## R script to call WinBUGS | |
``` | |
# clears workspace: | |
rm(list=ls()) | |
# sets working directories: | |
setwd("D:/core/LAB/Analysis/R/Bayes/8steps") | |
library(R2WinBUGS) | |
bugsdir <- "D:/Apps/WinBUGS14" | |
y <- c(106.2451019, | |
130.0098114, | |
105.0036545, | |
108.0337601, | |
100.6291046, | |
96.66761017, | |
107.7711563, | |
102.5716476, | |
96.08522034, | |
119.5092163, | |
72.42178345, | |
130.16362, | |
92.96968079, | |
95.4822998, | |
105.3284225, | |
93.37817383, | |
87.68320465, | |
122.9314728, | |
78.78004456, | |
88.33502197) | |
n <- length(y) | |
data <- list("y", "n") # to be passed on to WinBUGS | |
myinits <- list( | |
list(mu = 100, sigma = 100)) | |
# parameters to be monitored: | |
parameters <- c("mu", "tau") | |
samples = bugs(data, inits=myinits, parameters, | |
model.file ="deSchoot.txt", | |
n.chains=1, n.iter=1000, n.burnin=1, n.thin=1, | |
DIC=T, bugs.directory=bugsdir, | |
codaPkg=F, debug=T) | |
``` |
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