R help - Mar 2009 - Overlay plot: boxplot and stripchart

Hi,
I have a data.frame of this kind:
x
 obs  movie earned rating
1        P1   3.2    xx
2        P1   4.2    xx
3        P1   5.2    xx
4        P1   6.2    xx
5        P2   3.5    xx
6        P2   6.5    xx
7        P2   7.5    xx
8        P2   4.5    xx
9        P2   4.5    xx
10       P3   4.8    x1
11       P4   7.3    x2
12       P4   3.2    x2
13       P4   3.3    x2
I want to overlay the following boxplot and stripchart. I think that I 
had seen before in a discussion a thread about stripchart in R (maybe 
from Dalgaard), but although searching for it I couldn't find it.

boxplot(x$earned ~ x$movie)
stripchart(x$earned ~ x$movie, vertical=T,data=x, method="jitter",
pch=19)

Any suggestions are greatly appreciated, otherwise I have to go to 
points function.

Thanks,
Aldi

--

It seems almost too simple. Check to see if stripchart has an add= or  
other argument that lets you overlay charts. It does, so try this:

  boxplot(x$earned ~ x$movie)
  stripchart(x$earned ~ x$movie, vertical=T,data=x, method="jitter",  
add=TRUE, pch=19)

-- 
David Winsemius

On Mar 13, 2009, at 3:03 PM, Aldi Kraja wrote:
> Hi,
> I have a data.frame of this kind:
> x
> obs  movie earned rating
> 1        P1   3.2    xx
> 2        P1   4.2    xx
> 3        P1   5.2    xx
> 4        P1   6.2    xx
> 5        P2   3.5    xx
> 6        P2   6.5    xx
> 7        P2   7.5    xx
> 8        P2   4.5    xx
> 9        P2   4.5    xx
> 10       P3   4.8    x1
> 11       P4   7.3    x2
> 12       P4   3.2    x2
> 13       P4   3.3    x2
> I want to overlay the following boxplot and stripchart. I think that  
> I had seen before in a discussion a thread about stripchart in R  
> (maybe from Dalgaard), but although searching for it I couldn't find  
> it.
>
> boxplot(x$earned ~ x$movie)
> stripchart(x$earned ~ x$movie, vertical=T,data=x,
method="jitter",
> pch=19)
>
> Any suggestions are greatly appreciated, otherwise I have to go to  
> points function.
>
> Thanks,
> Aldi
>
> --
>
> ______________________________________________
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT