On 5/08/2008, at 1:31 AM, Frank E Harrell Jr wrote:
<snip>
I wonder why we don't just use the exact nonparametric confidence
interval for the median, which is just as easy to compute. Also,
it will be asymmetric if the data are skewed, as it should be.
<snip>
The boxplot.stats() function gives the same ``confidence interval''
for the median as the
boxplot() function. This isn't however *really* a confidence interval.
The help on boxplot() (see the ``notch'' argument) indicates that
this ``confidence interval''
actually provides a rough *hypothesis test* of the equality of *two*
medians. The null hypothesis
is rejected if the notches (confidence intervals) don't overlap.
cheers,
Rolf
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