[R] what does boxplot draw?
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Sun May 11 15:31:29 CEST 2003
Wladimir Eremeev <wl at eimb.ru> writes:
> Dear r-help,
> Unfortunately I cannot find in the documentation what determines
> ranges of a 'box' in the box-and-whisker plot.
> It is said in "Simple R" (http://www.math.csi.cuny.edu/Statistics/R/simpleR)
> that they are 1st and 3rd Qus usually.
> I tried to add to boxplot lines with (quantile(x,probs=0.25)), but
> lines do not coincide with edges of boxes.
The full story is in help(boxplots.stats). It's all a bit quirky, but
faithful to the original reference by Tukey. It may be illustrative to
do something like
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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