thank you all

plotCI is probably the closest to what I wanted to do -- draw the 
Confidence Interval curves around the fitted values (fit)

but I got the following wrong message while I tried plotCI?

Error in plotCI(x = 1:15, y = fit, ui = upr, li = lwr) : 
  object 'upr' not found






From:   Joseph Clark <joeclark77@hotmail.com>
To:     Liang Che/US/TLS/PwC@Americas-US, <r-help@r-project.org>
Date:   10/08/2012 04:03 PM
Subject:        RE: [R] How to use Lines function to draw the error bars?



I typically use the function "plotCI" from the "plotrix" package for 
confidence intervals or error bars.
The code would be:
 
library(plotrix)
plotCI( x=1:15, y=fit, ui=upr, li=lwr)


// joseph w. clark , visiting research associate
\\ university of nebraska at omaha - school of IS&T
 
> To: r-help@r-project.org
> From: liang.che@us.pwc.com
> Date: Mon, 8 Oct 2012 15:11:53 -0400
> Subject: [R] How to use Lines function to draw the error bars?
> 
> fit lwr upr
> 1 218.4332 90.51019 346.3561
> 2 218.3906 90.46133 346.3198
> 3 218.3906 90.46133 346.3198
> 4 161.3982 44.85702 277.9394
> 5 192.4450 68.39903 316.4909
> 6 179.8056 56.49540 303.1158
> 7 219.5406 91.52707 347.5542
> 8 162.6761 46.65760 278.6945
> 9 193.8506 70.59838 317.1029
> 10 181.3816 58.11305 304.6502
> 11 221.2871 92.14366 350.4305
> 12 164.2947 47.91081 280.6785
> 13 195.3415 72.04109 318.6418
> 14 182.7447 58.68660 306.8028
> 15 222.5223 91.86550 353.1791
> 
> 
> I have tried 
> 
> new<-data.frame(newdata$Unemployment)
> prd<-predict.lm(fit,newdata,interval=c("confidence"),level=0.95)
> lines (new,prd[,3],col="red",lty=2)
> 
> but it didn't give me anything.
> 
> thanks
> 
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