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plot() with TukeyHSD

2 messages · Owen, Jason, Brian Ripley

Original
Owen, Jason
# 
Hello,

When plotting the results of a TukeyHSD multiple comparisons
procedure with an ANOVA (lm) object, an extra line appears
in the confidence intervals that contain 0.  For example (this
is straight from the TukeyHSD helpfile):
An extra line segment appears in the interval to the right of the 
dotted zero line.  Coincidentally, if all of the calculated 
intervals for a dataset don't contain zero, this isn't a problem 
-- so I guess the line segment "belongs" to the zero line.  I
checked R Search and didn't find this mentioned before... but
please let me know if I overlooked something.

Jason

R 2.2.0 on Windows 
-- BTW, the error didn't happen on my Mac OSX w/ R 1.9.1

--
Assistant Professor of Statistics
Mathematics and Computer Science Department
University of Richmond, Virginia 23173
(804) 289-8081   fax:(804) 287-6664
http://www.mathcs.richmond.edu/~wowen

"This is R. There is no if. Only how."
Simon (Yoda) Blomberg
Brian Ripley
#
On Tue, 1 Aug 2006, Owen, Jason wrote:

            

      
      
      
    

        
You overlooked the following in the posting guide

  If you are using an old version of R and think it does not work 
  properly, upgrade to the latest version and try that, before posting. 

The NEWS for 2.2.1 says

    o	The plot() method for TukeyHSD() needed updating after adding
	adjusted p-values.  (PR#8229)

which is probably what you are referring to.

            

      
      
      
    

        
Far too old.