On Jan 5, 2008 7:45 PM, Milton Cezar Ribeiro <[EMAIL PROTECTED]> wrote:
> Dear all,
>
> I have a dataset which I need to estimate the regression model and plot the
> estimated curve two other curves with low and high confidence interval
> (CI=95%). How can I do that?
The easiest way is to use the ggplot2 package:
install.packages("ggplot2")
library(ggplot2)
x <- 1:100
y <- x^0.2+rnorm(100,0.1,0.1)
qplot(x, y, geom=c("smooth", "point"))
qplot(x, y, geom=c("smooth", "point"), method=lm)
qplot(x, y) + geom_smooth(fill="grey70", method=lm)
You can see more examples at http://had.co.nz/ggplot2/stat_smooth.html
Hadley
--
http://had.co.nz/
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