Hi Dennis
Works like a charm. It's some of the best help I have ever received.
Very thankful!
Eric
On 18/01/2010, at 19.12, Dennis Murphy wrote:
> Hi:
>
> There is a very similar example in the ggplot book by Hadley Wickham
> (section 4.5, pp. 50-52). Here's
> one approach using ggplot:
>
> library(ggplot2)
> p <- ggplot(tolerance.pp, aes(age, tolerance, group = id)) +
> geom_line()
> p + geom_smooth(aes(group = 1), size = 2)
>
> The second command adds a smoothing spline in blue, with twice the
> line width as the
> individual spaghetti plots, and by default, a confidence envelope
> around it. To get rid
> of the envelope, include se = FALSE as an argument to geom_smooth();
> to change the
> color, add the argument colour = 'red', for example.
>
> HTH,
> Dennis
>
> On Mon, Jan 18, 2010 at 3:25 PM, Eric Fail <e...@it.dk> wrote:
> Hi Ruser
>
> I'm trying to replicate some SAS code. I have to add a spline to my
> longitudinal spaghetti plot.
>
> I have the plot, but I can't add the spline, a overall trend line.
> In the SAS code they use the command 'I=SM50S' and I would prefer
> something similar. Im using R 2.10.1 on windows XP
>
> I have made this working example.
>
> tolerance.pp <-
> read.table("http://www.ats.ucla.edu/stat/R/examples/alda/tolerance1_pp.txt
> ", sep=",", header=T)
> # install.packages("lattice", dep = T)
> library(lattice)
> xyplot(tolerance ~ age, groups = id, data=tolerance.pp, type = "l")
>
> This is where I want to add a overall spline.
>
> Hope someone out there can figure this out.
>
> Thanks
>
> Eric
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