Message-ID: <995CF341-31C2-4992-808C-29650BCA48B0@gmail.com>
Date: 2011-08-24T14:13:35Z
From: Peter Dalgaard
Subject: Odp: boxplot from mean and SD data
In-Reply-To: <OFE6318CE3.2D8502BD-ONC12578F6.003D5FE6-C12578F6.003E0039@precheza.cz>
On Aug 24, 2011, at 13:18 , Petr PIKAL wrote:
> Hi
>>
>> Dear all,
>>
>> I have a dataset of 3 categorical factors, the mean and the standard
>> deviation of each value. I want to use these values to plot a boxplot,
>> grouped by each of the 3 categorical factors (24 boxplots in total). I
>> don't have a clue on how to do the boxplot from mean and SD data already
> calculated.
>
> I am afraid that you can not do it.
Or, you can't do it without modifying the definition of a boxplot. There are variations in which the box is mean +/- 2SD and the whiskers show the range, but I consider that a doubleplusungood idea -- box plots should be box plots!
> Only if you you accept assumption that
> distribution within each factor is normal and therefore median equals
> mean. You can than also use 25 an 75 percentile for box construction.
>
> see ?boxplot and ?bxp for internals of plotting function.
>
> One possibility also is to generate values by mean and sd parameters to
> rnorm, although I do not see the reason for doing it.
>
> Regards
> Petr
>
>
>>
>> Thanks in advance
>>
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com
"D?den skal tape!" --- Nordahl Grieg