[R] loess lines in xyplot with two or more variables on the left side of a formula

[Gabor Grothendieck]

Try this:

xyplot(IDUPREV + VALIDAT~ YEAR | MSA, data = df, type= c("smooth", "o"))

On 11/23/06, Chuck Cleland <ccleland at optonline.net> wrote:
> Hello:
>  I recall something like this being discuss recently, but I can't seem
> to locate an example in the archives.  I have data like the following:
>
> df <- expand.grid(1:4, 1992:2002)
> names(df) <- c("MSA", "YEAR")
> df$IDUPREV <- runif(44)
> df$VALIDAT <- rnorm(44)
>
>  I want to create an xyplot() with separate loess lines for each series
> (IDUPREV and VALIDAT) in the same panel.  I'm able to plot each series
> in the same panel like this:
>
> library(lattice)
>
> xyplot(IDUPREV + VALIDAT ~ YEAR | MSA, data = df,
>       panel = panel.superpose, type="l")
>
>  How could I change that so that panel.loess() is applied separately to
> each series?
>
> thanks,
>
> Chuck Cleland
>
> --
> Chuck Cleland, Ph.D.
> NDRI, Inc.
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