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Plot HDRs with confidence intervals

Source: R/plot.hdr.conf.R
plot.hdrconf.Rd

Plots Highest Density Regions with confidence intervals.

Usage

# S3 method for hdrconf
plot(x, den, ...)

Arguments

x

Output from hdrconf.

den

Density of data as list with components x and y.

...

Other arguments are passed to plot.

Value

None

References

Hyndman, R.J. (1996) Computing and graphing highest density regions American Statistician, 50, 120-126.

See also

hdrconf

Author

Rob J Hyndman

Examples

x <- c(rnorm(100,0,1),rnorm(100,4,1))
den <- density(x,bw=bw.SJ(x))
trueden <- den
trueden$y <- 0.5*(exp(-0.5*(den$x*den$x)) + exp(-0.5*(den$x-4)^2))/sqrt(2*pi)
sortx <- sort(x)

par(mfcol=c(2,2))
for(conf in c(50,95))
{
  m <- hdrconf(sortx,trueden,conf=conf)
  plot(m,trueden,main=paste(conf,"% HDR from true density"))
  m <- hdrconf(sortx,den,conf=conf)
  plot(m,den,main=paste(conf,"% HDR from empirical density\n(n=200)"))
}