We are using S-Plus 4.5 Professionnal Release 2 on Windows NT v4.0.
We can neither solve nor find a description to the following problem in
S-Plus, which is solved very elegantly in Statistica. Since we are
convinced there is a S-Plus solution, we would appreciate anybody's
help.
The problem:
We want to make categorised box plots off one variable. The category X
would be the year {1994, 1995, 1996, 1997, 1998} and the variable Y
would be a ratio calculated for one year X and a given set of
instrument. The set is not necesarily the same every year. Let's say for
example it has 600 ratios in 1994, 650 in 1995, 800 in 1996, 1200 in
1997 and 1333 in 1998. So each box and whisker plot represents a subset
of a different size.
For each box, we want the median and the quartiles drawn as is
automatically, but the whiskers should cut at a given percentile (e.g.5%
and 95% or 10% and 90%), and not at the standard 1.5 time the
inter-quartile range (see DETAILS in the help on the "boxplot"
function).
How can we do it ?
Thanks for your help.
Philippe Sormani & Donato Scognamiglio
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