[R] Graphing a non-linear regresion line on a scatter plot.

[Baigo]

Hey

I've been attempting to draw the non-parametric part of a regression on a
scatter plot, with confidence intervals if possible. Even if I tried, I
failed, reason why I'm asking here 

library(np)
library(foreign)  

wage1 <- read.dta(file="PATH HERE\\wage1.dta")
reg.np <- npplreg(lwage ~ female + married + educ + tenure | exper, data =
wage1)

plot(reg.np)

plot(wage1$exper, wage1$lwage, xlab = "age", ylab = "log(wage)")
lines(wage1$exper, fitted(reg.np), lty = 1, col = "blue")

This was one of the many attempts I tried. I'd really appreciate if someone
could help.

wage1 Database: http://www.sendspace.com/file/txksv3

Thanks!

Martín



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