R help - Nov 2012 - Plotting the regression curve with its confidence interval

Hello.

How can I plot the regression curve with its confidence interval?
I use nls(y~a*x^b), then plot(x,y), add curve with
lines(x,predict(nls(y~a*x^b))). But I can't add to plot CI for my curve.

Thanks in advance,
Denis

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On Nov 10, 2012, at 9:36 PM, ?????? ????? wrote:
> Hello.
> 
> How can I plot the regression curve with its confidence interval?
> I use nls(y~a*x^b), then plot(x,y), add curve with
lines(x,predict(nls(y~a*x^b))). But I can't add to plot CI for my curve.
Have your read:

?predict.nls  # ?


-- 
David Winsemius, MD
Alameda, CA, USA

On 11/11/2012 04:36 PM, ?????? ????? wrote:
> Hello.
>
> How can I plot the regression curve with its confidence interval?
> I use nls(y~a*x^b), then plot(x,y), add curve with
lines(x,predict(nls(y~a*x^b))). But I can't add to plot CI for my curve.
>
Hi Denis,
If you know where you want the lines for the CI the dispersion function 
in the plotrix package will do what you want, use the type=l and 
border=1 arguments with fill=NA.

Jim