[R] box plot and plot whiskers

David L Carlson dcarlson at tamu.edu
Fri Jul 13 18:14:16 CEST 2012

The whiskers will not be symmetrical if 1.5*IQR extends beyond the maximum or minimum values. In that case, the whisker stops at the maximum or minimum.

David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77840-4352

----- Original Message ----- 

From: "Barbara Uszczynska" <uszczynska at gmail.com> 
To: r-help at r-project.org 
Sent: Friday, July 13, 2012 7:40:30 AM 
Subject: [R] box plot and plot whiskers 

Dear R users, 

I have question concerning box plot and it's whiskers. As I understood from 
the description of the boxplot() function, if the range value is positive 
the plot whiskers extend out from the box to the most extreme data points 
defined by the values of the IQR times range (default 1.5). It suggests 
that the upper and lower plot whiskers should be more less the same length. 
What does it mean if they are not? How it's possible? I'm using default 
value of the range. 

Would be garateful for any hint. 

Kind regards, 


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