The reference is given in the help file
?boxplot
as
McGill, R., Tukey, J. W., and Larsen, W. A. (1978). Variations of box plots.
The American
Statistician, 32, 12-16.
---- Original message ----
>Date: Tue, 27 Sep 2005 10:37:12 +1000 (EST)
>From: Kathryn Jones <kathryn.jones@jcu.edu.au>
>Subject: [S] Boxplot Confidence Intervals
>To: s-news@wubios.wustl.edu
>
>Hi,
>I need to know how the confidence intervals are calculated for
>the median when used in the boxplot() command.
>Does anyone know where I can look, or does anyone have a
>reference?
>
>Thank you very much,
>K Jones
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