[S] Multiple error bar charts

Ori Davidov (ori@fhcrc.org)
Thu, 3 Sep 1998 08:28:49 -0700 (PDT)


I have a data frame with 4 columns that looks something like this:

Chem time means sds
A 0
A 1

A 10
B 0

The first column is a factor with treatment levels (A-D). The second
column contains a time variable which ranging from 0-10 for each
level of the treatment factor. The remaining columns means and sds give
the mean and standard deviation of the concentration of chemical treatment
at the corresponding time.

I would like to generate an error bar chart plotting all graphs together,
how do I do that?

Any help will be appreciated, thanks,


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