R help - Mar 2005 - alternative to 'groups' for lattice bwplot()

Hi,

Is there some alternative to the 'groups' argument in lattice's
bwplot
function for boxplots? Say in the example below:

bwplot(yield ~ site | year, data = barley)

you want to have two side by side boxplots per site, corresponding to each
year in the barley data frame. Ideally, the space between boxplots of the
same site should be smaller than that between boxplots of different sites.

This seemed like a job for the 'groups' argument, but panel.bwplot
doesn't
take it. I saw that boxplot() might do this for the particular example
above, but not for a more complex one with additional conditioning
variables (as in my actual problem).

I thought I'd find something about this in the archives, but I'm either
not using the right keywords or the question hasn't come up yet.

Some help on how to deal with this please?

-- 
Sebastian P. Luque

I'm afraid you have lost me. What is it that you want that reordering the
formula does not achieve.

bwplot(yield ~ year | site, data = barley) has sites next to each other. If the
lattice structure is your issue (it appears you wish to remove the structure and
replace it with a wider space) then I guess you might find writing your own code
easier than forcing lattice to be something other than itself.
> -----Original Message-----
> From: Sebastian Luque [mailto:sluque at mun.ca]
> Sent: Wednesday, 23 March 2005 2:11 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] alternative to 'groups' for lattice bwplot()
> 
> 
> Hi,
> 
> Is there some alternative to the 'groups' argument in lattice's
bwplot
> function for boxplots? Say in the example below:
> 
> bwplot(yield ~ site | year, data = barley)
> 
> you want to have two side by side boxplots per site, 
> corresponding to each
> year in the barley data frame. Ideally, the space between 
> boxplots of the
> same site should be smaller than that between boxplots of 
> different sites.
> 
> This seemed like a job for the 'groups' argument, but 
> panel.bwplot doesn't
> take it. I saw that boxplot() might do this for the particular example
> above, but not for a more complex one with additional conditioning
> variables (as in my actual problem).
> 
> I thought I'd find something about this in the archives, but 
> I'm either
> not using the right keywords or the question hasn't come up yet.
> 
> Some help on how to deal with this please?
> 
> -- 
> Sebastian P. Luque
> 
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>

On Wednesday 23 March 2005 00:10, Sebastian Luque wrote:
> Hi,
>
> Is there some alternative to the 'groups' argument in lattice's
> bwplot function for boxplots? Say in the example below:
>
> bwplot(yield ~ site | year, data = barley)
>
> you want to have two side by side boxplots per site, corresponding to
> each year in the barley data frame. Ideally, the space between
> boxplots of the same site should be smaller than that between
> boxplots of different sites.
>
> This seemed like a job for the 'groups' argument, but panel.bwplot
> doesn't take it. I saw that boxplot() might do this for the
> particular example above, but not for a more complex one with
> additional conditioning variables (as in my actual problem).
I consider bwplot to already provide a grouped display (box plots are 
univariate summaries, and bwplot allows you to display several of them 
together within a panel). What you are looking for may be appropriate 
in certain situations, but is not general enough to warrant a built-in 
implementation. In other words, you'll have to write your own panel 
function.
> I thought I'd find something about this in the archives, but I'm
> either not using the right keywords or the question hasn't come up
> yet.
The only instance I can recall is:

http://tolstoy.newcastle.edu.au/R/help/04/02/0848.html

Deepayan