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### R code from vignette source 'MultilevelModeling.Rnw'
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### code chunk number 1: MultilevelModeling.Rnw:17-24
###################################################
d <- data.frame(Name=c("Clemente", "Robinson", "Howard", "Johnstone",
"Berry", "Spencer", "Kessinger", "Alvarado", "Santo",
"Swaboda", "Petrocelli", "Rodriguez", "Scott", "Unser",
"Williams", "Campaneris", "Munson", "Alvis"),
Hits=c(18, 17, 16, 15, 14, 14, 13, 12, 11,
11, 10, 10, 10, 10, 10, 9, 8, 7),
At.Bats=45)
###################################################
### code chunk number 2: MultilevelModeling.Rnw:59-64
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library(LearnBayes)
laplace.fit <- laplace(betabinexch,
c(0, 0),
d[, c("Hits", "At.Bats")])
laplace.fit
###################################################
### code chunk number 3: MultilevelModeling.Rnw:68-73
###################################################
mcmc.fit <- rwmetrop(betabinexch,
list(var=laplace.fit$var, scale=2),
c(0, 0),
5000,
d[, c("Hits", "At.Bats")])
###################################################
### code chunk number 4: MultilevelModeling.Rnw:77-81
###################################################
mycontour(betabinexch, c(-1.5, -0.5, 2, 12),
d[, c("Hits", "At.Bats")],
xlab="Logit ETA", ylab="Log K")
with(mcmc.fit, points(par))
###################################################
### code chunk number 5: MultilevelModeling.Rnw:88-99
###################################################
eta <- with(mcmc.fit, exp(par[, 1]) / (1 + exp(par[, 1])))
K <- exp(mcmc.fit$par[, 2])
p.estimate <- function(j, eta, K){
yj <- d[j, "Hits"]
nj <- d[j, "At.Bats"]
p.sim <- rbeta(5000, yj + K * eta, nj - yj + K * (1 - eta))
quantile(p.sim, c(0.05, 0.50, 0.95))
}
E <- t(sapply(1:18, p.estimate, eta, K))
rownames(E) <- d[, "Name"]
round(E, 3)
###################################################
### code chunk number 6: MultilevelModeling.Rnw:105-115
###################################################
plot(d$Hits / 45, E[, 2], pch=19,
ylim=c(.15, .40),
xlab="Observed AVG", ylab="True Probability",
main="90 Percent Probability Intervals")
for (j in 1:18)
lines(d$Hits[j] / 45 * c(1, 1), E[j, c(1, 3)])
abline(a=0, b=1, col="blue")
abline(h=mean(d$Hits) / 45, col="red")
legend("topleft", legend=c("Individual", "Combined"),
lty=1, col=c("blue", "red"))
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