[R] Boxplot by factors

[Achim Zeileis]

On Wed, 2 Feb 2005 14:29:49 -0600 msck9 at mizzou.edu wrote:

> Dear all, 
>  I have the following data format
> 
> 
>  cellnumber    force
>  	1	100
> 	1	230
> 	1	100
> 	1 	200
> 	1	130
> 	1	210
> 	2	179
> 	2	298
> 	2	400
> 	2	500
> 	2	600
> 	...........
> I want to make a boxplot of the force according to the cellnumber.
> Here the cellnumber is actually a factor. It has 1, 2 two levels. How
> can I do that using boxplot? 

Look at ?boxplot and also example(boxplot).

Hint: What you want is already described in the first line of that
example!
Z

> Thanks in advance
> Ming
> 
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