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Re: Box-Whisker plots in IDL [message #55411 is a reply to message #55410] Mon, 20 August 2007 10:10 Go to previous messageGo to previous message
David Fanning is currently offline  David Fanning
Messages: 11724
Registered: August 2001
Senior Member
teich@atmsci.msrc.sunysb.edu writes:

> Does anyone know of a way for IDL to make box-whisker plots? I know
> IDL get calculate the median, but how about the 25th and 75th
> percentiles which are needed for such a plot?

See the histogram tutorial for a fast way to find the
quartiles of a number distribution, which is what you
will need to calculate the 25th and 75th percentiles.
That is, the 25th percentile will be the median of the
lower two quartiles of values, and the 75 percentile will
be the median of the upper two quartiles.

http://www.dfanning.com/tips/histogram_tutorial.html

The rest is just PLOTS commands. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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