[R] plotting grouped data object

[Deepayan Sarkar]

On 9/23/06, Afshartous, David <afshart at exchange.sba.miami.edu> wrote:
>
> All,
> I'd like to plot the main relationship of a grouped data
> object for all levels of a factor in a single panel.
> The sample code below creates a separate panel for each level
> of the factor.  I realize that this could be done in other ways,
> but I'd like to do it via plotting the grouped data object.
> thanks!
> dave
>
> z = rnorm(18, mean=0, sd=1)
> x = rep(1:6, 3)
> y = factor(rep(c("I", "C", "P"), each = 6))
> dat = data.frame(x, y, z)
> data.grp = groupedData(z ~ x | y, data = dat)
> plot(data.grp, outer = ~ y)
> ### this produces 1 line each in 3 panels
> ### how to collapse all 3 lines into 1 panel?

The closest I can get is

dat$one <- gl(1, 18)
data.grp = groupedData(z ~ x | one, data = dat)
plot(data.grp, innerGroups = ~y, strip = FALSE)

-Deepayan