R help - Nov 2000 - boxplot grouped by two variables.

Is there a quick way to make boxplots groups by two variables?  By that 
I mean, that if x axes have values ("A","B","C"),
than at each value
there would be a few boxplots each for a value of second variable (say 
("1","2","3")).

Thank You.
-- 
Vadim Kutsyy
http://www.kutsyy.com                     vadim at kutsyy.com
The University of Michigan - Ann Arbor         PhD Student

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Hello,

you can make a new variable with the values A1, A2, A3, B1, B2 ...
and then do a boxplot and define you own axis-labels.

I guess it is not the most elegant way ...

Hope it helps

jan

On Tue, 21 Nov 2000, Vadik Kutsyy wrote:
> Is there a quick way to make boxplots groups by two variables?  By that 
> I mean, that if x axes have values
("A","B","C"), than at each value
> there would be a few boxplots each for a value of second variable (say 
> ("1","2","3")).
+-----------------------------------
 Jan Goebel (mailto:jgoebel at diw.de)

 DIW Berlin 
 Longitudinal Data and Microanalysis
 K?nigin-Luise-Str. 5
 D-14195 Berlin -- Germany --
 phone: 49 30 89789-377
+-----------------------------------
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Hi Vadik,

On Tue, 21 Nov 2000, Vadik Kutsyy wrote:
> Is there a quick way to make boxplots groups by two variables?  By that 
> I mean, that if x axes have values
("A","B","C"), than at each value
> there would be a few boxplots each for a value of second variable (say 
> ("1","2","3")).
If I understand you correctly you want to try the "interaction"
function
in a boxplot.  Your data needs to be organised into a data.frame with
appropriate factors.  Here's a simple example ...

data(warpbreaks)
boxplot(breaks~interaction(wool, tension), data=warpbreaks, col=2:3)

Hope this helps, Jonathan.

Jonathan Rougier                       Science Laboratories
Department of Mathematical Sciences    South Road
University of Durham                   Durham DH1 3LE
http://www.maths.dur.ac.uk/stats/people/jcr/jcr.html


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> On Tue, 21 Nov 2000, Vadik Kutsyy wrote:
>
> > Is there a quick way to make boxplots groups by two
> variables?  By that
> > I mean, that if x axes have values
("A","B","C"), than at
> each value
> > there would be a few boxplots each for a value of second
> variable (say
> > ("1","2","3")).
>
> If I understand you correctly you want to try the
> "interaction" function
> in a boxplot.  Your data needs to be organised into a data.frame with
> appropriate factors.  Here's a simple example ...
I'd rather prefer to have something like

  coplot(breaks | wool * tension, data = warpbreaks, panel=function(x, y,
...)boxplot(x))

but there are three problems:

1) coplot doesn't seem to support univariate panel functions
2) coplot doesn't seem to support synchronization options for xlim= and
ylim= across panels
3) plot functions appear to be EITHER panel functions OR high level plot
functions. Needing two versions for each plot function is a little bit
complicated. Rather have ONLY panel functions and a one-panel high level
wrapper.

Here are my questions:

a) Any plans to implement trellis?
b) Are there any other solutions in R which offer simple trellis
functionality?
c) Do you think, attacking these problems leads to reinventing trellis with
all it's complexity?

If the answers turn out to be c(a=NO,b=NO,c=NO) I would like  to ask in more
detail:

Is it possible to write plot functions to properly behave as high level AND
as panel functions?
Are there any issues that NEED to be addressed beyond 1) to 3) ?
Any recommendations? Any related work in progress? Any volunteers?

If nobody else is attacking this, I will think about a solution (r-devel:
AFTER the strwidth() issue has been resolved)


Jens


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