From: P Ehlers <ehlers_at_math.ucalgary.ca>

Date: Fri 02 Dec 2005 - 03:57:38 EST

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> Evgeniy> Hello to all users and wizards.

*> Evgeniy> I am regulary using 'boxplot' function or its analogue - 'bwplot' from
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*> Evgeniy> the 'lattice' library.
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*>
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*> [there's the lattice *package* !]
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*>
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*> Evgeniy> But they are, as far as I understand, totally
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*> Evgeniy> flawed in functionality: they miss ability to select what they would
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*> Evgeniy> draw 'in the middle' - median, mean. What the box means - standard
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*> Evgeniy> error, 90% or something else. What the whiskers mean - 100%, 99% or
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*> Evgeniy> something else.
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*> Evgeniy> Is there any way to realize it? Or is there any other good data
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*> Evgeniy> visualization function for comparing means of various data groups?
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*> Evgeniy> Ideally I would like to have a bit more customised function for doing
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*> Evgeniy> that. For example, 'boxplot(a~b,data=d,mid='mean').
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*>
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*>
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*> Evgeniy> --
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*> Evgeniy> Evgeniy, ICQ 38317310.
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*>
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R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Dec 02 05:05:14 2005

Date: Fri 02 Dec 2005 - 03:57:38 EST

I'd like to add two comments to Martin's sensible response.

> Boxplots were invented by John W. Tukey and I think should be

*> counted among the top "small but smart" achievements from the
**> 20th century. Very wisely he did *not* use mean and standard deviations.
**>
**> Even though it's possible to draw boxplots that are not boxplots
**> (and people only recently explained how to do this with R on this
**> mailing list), I'm arguing very strongly against this.
**>
**> If I see a boxplot - I'd want it to be a boxplot and not have
**> the silly (please excuse) 10%--------90% whiskers which
**> declare 20% of the points as outliers {in the boxplot sense}.
**>
**> If you want the mean +/- sd plot, do *not* misuse boxplots
**> for them, please!
**>
**> Martin Maechler, ETH Zurich
**>
**>
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>>>>>>"Evgeniy" == Evgeniy Kachalin <ka4alin@yandex.ru> >>>>>> on Thu, 01 Dec 2005 19:04:47 +0300 writes:

> Evgeniy> Hello to all users and wizards.

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Dec 02 05:05:14 2005

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