[R] Errors on bar plots

[Fikret Isik]

Hi R Gurus,

I am a new R user. I did my home work by reading the manuals and 
searching the internet for examples but failed to find an example before 
writing this message for help.

I would like to create bar plots with the standard error of the mean (or 
95% confidence intervals) on the bar.

Any suggestions will be appreciated.

Operating system: Windows XP pro
R version 2.1.0

Data look like this:

Site Family  Height
1     A         12.3
1     B         13.5
1     C         17.4
2     A         14.0
2     B         11.1
2     C         15.9
.       .          .

Fikret Isik


-- 
Fikret Isik, 
Research Assistant Prof.
 Department of Forestry and Env. Resources
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