Try this:

library(lattice)
bwplot(values ~ TimePeriod | ind, cbind(stack(my.data), TimePeriod =
my.data$TimePeriod))

On Tue, Jun 22, 2010 at 1:45 PM, Shawn Morrison <
shawn.morrison@dryasresearch.com> wrote:

> Hi all,
>
> I have a dataset with several variables, each of which is a separate
> column. For each variable, I want to produce a boxplot and include the name
> of the variable (ie, column name) on each plot.
>
> I have included a sample dataset below. Can someone tell me where I am
> going wrong?
>
> Thank you for your help,
> Shawn Morrison
>
> # Generate a sample dataset
> var1 = rnorm(1000)
> var2 = rnorm(1000)
> TimePeriod = rep((LETTERS[1:4]), 250)
>
> my.data = as.data.frame(cbind(var1, var2, TimePeriod)); summary(my.data)
> attach(my.data)
>
> # Create box plots for var1 and var2 using TimePeriod on the x-axis
> lapply(my.data[,1:2], function(y) {
>    boxplot(y~TimePeriod,
>                main = y
>                data = my.data)
>
>    })
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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