[R] indicating significant differences in boxplots

From: Sebastian Merz <sebastian.merz_at_web.de>
Date: Mon, 07 Jul 2008 11:19:20 +0200

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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