Re: [R] plot() with TukeyHSD

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Wed 02 Aug 2006 - 16:05:37 EST

On Tue, 1 Aug 2006, Owen, Jason wrote:

> 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):
>
> > summary(fm1 <- aov(breaks ~ wool + tension, data = warpbreaks))
> > TukeyHSD(fm1, "tension", ordered = TRUE)
> > plot(TukeyHSD(fm1, "tension"))
>
> 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.

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.

>
> Jason
>
> R 2.2.0 on Windows

Far too old.

> -- 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
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Wed Aug 02 16:17:46 2006

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