Re: [R] how to generate bar charts with the standard deviation

From: Marc Schwartz <marc_schwartz_at_comcast.net>
Date: Thu, 13 Mar 2008 10:31:32 -0500

Ng Stanley wrote:
> Hi,
>
> I have the two vectors mean and sd of individual columns, but I am unsure
> how to generate bar charts with the standard deviation, even after looking
> the help of barplot and barplot.2.

Barplots are not well suited for presenting continuous data and many would argue that even for proportions, they should not be used to present CI's.

You are better off using:

  1. plotCI() in the gplots package:

http://cged.genes.nig.ac.jp/RGM2/R_current/library/gplots/man/plotCI.html

2. plotmeans() in the same, which is a wrapper to the above:

http://cged.genes.nig.ac.jp/RGM2/R_current/library/gplots/man/plotmeans.html

3. errbar() in the Hmisc package:

http://cged.genes.nig.ac.jp/RGM2/R_current/library/Hmisc/man/errbar.html

4. arrows() and/or segments() in the default R installation, which can be used like errbar() to add CI's to points.

HTH, Marc Schwartz



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