On 6/7/07, Alan S Barnett <[EMAIL PROTECTED]> wrote:
> How do I add to a trellis plot the best fit line from a robust fit? I
> can use panel.lm to add a least squares fit, but there is no panel.rlm
> function.
It's not trellis, but it's really easy to do this with ggplot2:
install.packages("ggplot2", dep=T)
library(ggplot2)
p <- qplot(x, y, data=diamonds)
p + geom_smooth(method="lm")
p + geom_smooth(method="rlm")
p + geom_smooth(method="lm", formula="y ~ poly(x,3)")
see http://had.co.nz/ggplot2/stat_smooth.html for more examples.
Hadley
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