R help - Apr 2009 - Histogram with lattice with two 'conditional' variables

Hello dear R-community,

    I have been trying to figure out a way to generate histograms of a numeric
variable observed in different entities ('individual' below). Each one
of this entities is classified as "A" or "B" (according to
the pseudo-code below):


variable<-sample(rep(1:10,10))
individual<-rep(1:10, length(variable))
group<-rep(LETTERS[1:2],length(variable)/2)

mydata<-data.frame(variable,individual,group)

library('lattice')

attach(mydata)
individual<-as.factor(individual)
group<-as.factor(group)
histogram(~variable|individual+group)

   If you run the above code you will obtain a series of panels that correspond
to every entity, but replicated, which makes sense because I am telling it to
generate histograms by entity and by group, but the reality is that each entity
only belongs to one of the groups, but then some plots appear empty, as they
should. That means that only the plots that have data in it are 'real'.

   My question is: how can I generate a layout where only the 'real'
data exists and still get the two strips that specify the individual and group?

Thank you very much in advance for any help you can provide me with,

Judith

On Thu, Apr 2, 2009 at 3:16 PM, Judith Flores <juryef at yahoo.com>
wrote:
>
> Hello dear R-community,
>
> ? ?I have been trying to figure out a way to generate histograms of a
numeric variable observed in different entities ('individual' below).
Each one of this entities is classified as "A" or "B"
(according to the pseudo-code below):
>
>
> variable<-sample(rep(1:10,10))
> individual<-rep(1:10, length(variable))
> group<-rep(LETTERS[1:2],length(variable)/2)
>
> mydata<-data.frame(variable,individual,group)
>
> library('lattice')
>
> attach(mydata)
> individual<-as.factor(individual)
> group<-as.factor(group)
> histogram(~variable|individual+group)
>
> ? If you run the above code you will obtain a series of panels that
correspond to every entity, but replicated, which makes sense because I am
telling it to generate histograms by entity and by group, but the reality is
that each entity only belongs to one of the groups, but then some plots appear
empty, as they should. That means that only the plots that have data in it are
'real'.
>
> ? My question is: how can I generate a layout where only the 'real'
data exists and still get the two strips that specify the individual and group?
histogram(~variable| interaction(individual, group))

-Deepayan