Re: [R] indicating significant differences in boxplots

From: John Kane <jrkrideau_at_yahoo.ca>
Date: Mon, 07 Jul 2008 13:30:43 -0700 (PDT)


HI Sebasian,

I don't think I have ever seen this type of presentation. Could you provide a reference to a journal article that uses this? It might make it easier to visualize exactly what you want.

> From: Sebastian Merz <sebastian.merz_at_web.de>
> Subject: [R] indicating significant differences in boxplots
> To: r-help@r-project.org
> Received: Monday, July 7, 2008, 5:19 AM
> Hi all!
>
> Writing a paper using a lot of boxplots I was asked to mark
> the
> significant differences between plotted groups using
> "stars on
> top".
>
> These stars are found freqeuntly in medical papers and
> printed
> above boxplots when there is a significant difference
> (usually using a
> bar to indicate which groups are meant if there are more
> then two in a
> plot).
>
> I was able to calculate whatever test, check the
> significance and
> depending on it to put a star (written with text-function)
> between
> two groups in a boxplot. But I was not
> able to make the text between two groups apear above the
> actual
> plotting region nor to draw a simple line, indicating which
> plots are
> meant. Also this solution seems to more of a hack then
> actual
> programming.
>
> Is there a better way to solve this issue? Any ideas where
> to look?
>
> I hope I haven been clear and thank you for your effort,
> S. Merz
>
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