st: RE: Adjacent values in graph_box

["Wallace, John" <John_Wallace@affymetrix.com>]

Having found my wayward graphics manual, I've located the answer to my first question: the default values are the calculations proposed by Tukey in his 1977 text, Exploring Data Analysis.  The distance to the adjacent values is a multiple of the IQR (3/2 * (75^th% - 25^th%)).  It doesn't look like there is an explicit way to change this (make it 3SD, for example).  Does anyone know if this is ado-able, or is the graphics engine that generates the boxplot not accessible this way?

 

-JW

 

-----Original Message-----
From: Wallace, John [mailto:John_Wallace@affymetrix.com]
Sent: Tuesday, June 01, 2004 11:33 AM
To: 'statalist@hsphsun2.harvard.edu'
Cc: Chung, John
Subject: st: Adjacent values in graph_box

 

Hi all

I've misplaced my graphics manual at the moment, and I'm trying to figure out two things:

1)     what are the default values for the adjacent values (location of the end of the whiskers on a boxplot)

2)     Can/how are they altered?

 

I thought it was -graph box, cwhiskers(...)-, but that appears to be for the appearance of the whiskers (line weight, cap appearance, etc)

 

Thanks for any help,

John Wallace | Research Associate | Test Method Development

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