work/boxplot-quantiles.R

In rsachse/limnotools: Help Tools of TU Dresden's Limnology Workgroup

#This function replaces boxplot.stats --- it uses the middle 50% and
#middle 90% instead of middle 50%(IQR) and 1.5*IQR.
myboxplot.stats <-  function (x, coef = NULL, do.conf = TRUE, do.out = TRUE) 
{
  nna <- !is.na(x)
  n <- sum(nna)
  stats <- quantile(x, c(.05,.25,.5,.75,.95), na.rm = TRUE)
  iqr <- diff(stats[c(2, 4)])
  out <- x < stats[1] | x > stats[5]
  conf <- if (do.conf) 
    stats[3] + c(-1.58, 1.58) * diff(stats[c(2, 4)])/sqrt(n)
  list(stats = stats, n = n, conf = conf, out = x[out & nna])
}