[R] indicating significant differences in boxplots

[John Kane]

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.  




--- On Mon, 7/7/08, Sebastian Merz <sebastian.merz at web.de> wrote:

> From: Sebastian Merz <sebastian.merz at web.de>
> Subject: [R] indicating significant differences in boxplots
> To: r-help at 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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