```
plot.CI <- function(x,...){
# histogram of posterior samples
hist(x,100,freq=FALSE,
main=paste("posterior distribution for ",deparse(substitute(x)),sep=" "),
xlab=deparse(substitute(x)),...)
# indicate 95% credible interval, mean, and median
abline(v=quantile(x,c(.025,.975)),lwd=2,col="red")
abline(v=mean(x),lwd=2,col="green")
abline(v=median(x),lwd=2,col="blue")
# legend
legend("topright",
legend=c(paste(c("lower bound 95% CI","upper bound 95% CI"),
round(quantile(x,c(.025,.975)),3),sep=": "),
paste("mean",round(mean(x),3),sep=": "),
paste("median",round(median(x),3),sep=": ")),
col=c("red","red","green","blue"),lty=1,lwd=2)
}
```

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