mean +/- SEM

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?mean
?sd
?plot

The request to plot mean has no context yet. What sort of problem are  
you working with? You will get better answers if you first read the  
Posting Guide and then provide example data.
David Winsemius

On Mar 10, 2009, at 6:39 PM, Stefo Ratino wrote:

> Hi all,
>
> I am looking for a R function which unables me to plot mean +/- SEM.  
> Is there such a function in R?
>
> Many thanks,
> Stefo
>
>
>
>
> 	[[alternative HTML version deleted]]
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
Heritage Laboratories
West Hartford, CT
Hi all,

I am looking for a R function which unables me to plot mean +/- SEM. Is there such a function in R? 

Hi Stefo,
The "dispersion" function in the plotrix package (among many, many 
others in other packages) allows you to stick "error bars" onto almost 
anything.

Jim
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