[R] Plotting the mean of data

[Uwe Ligges]

Kare Edvardsen wrote:

> Hi all!
> 
> I've got a datstructure like this:
> 
> subject  week  value
> 
> 1	1	4
> 2	1	8
> 3	1	3
> 4	1	5
> 
> 1	2	5
> 2	2	6
> 3	2	2
> 4	2	6
> 
> 1	3	3
> 2	3	7
> 3	3	3
> 4	3	7
> 
> I'd like to plot the mean of 'value' against week. Is there a direct way 
> of doing this or do I have to make a new structure with the calculated 
> values and then plot it?

For your data.frame X, you want, e.g.:

   A <- aggregate(X, list(X$week), mean)
   plot(A$week, A$value)

Uwe Ligges

> All the best!
>