R help - Sep 2009 - Derivative of nonparametric curve

Dear All,

I'm looking for?a way on computing the derivative of first and second
order?of a smoothing curve produced by a nonprametric regression. For instance,
if we run the R script below, a smooth nonparametric regression curve is
produced.

provide.data(trawl)
Zone92?? <- (Year == 0 & Zone == 1)
Position <- cbind(Longitude - 143, Latitude)
dimnames(Position)[[2]][1] <- "Longitude - 143"
sm.regression(Longitude, Score1, method = "aicc", col =
"red",? model = "linear")

Could someone please give some hints?on the way to?find the derivative?on the
curve at?some points ?

Thank you.
Kagba

On 8/09/2009, at 9:07 PM, FMH wrote:
> Dear All,
>
> I'm looking for a way on computing the derivative of first and  
> second order of a smoothing curve produced by a nonprametric  
> regression. For instance, if we run the R script below, a smooth  
> nonparametric regression curve is produced.
>
> provide.data(trawl)
> Zone92   <- (Year == 0 & Zone == 1)
> Position <- cbind(Longitude - 143, Latitude)
> dimnames(Position)[[2]][1] <- "Longitude - 143"
> sm.regression(Longitude, Score1, method = "aicc", col =
"red",
> model = "linear")
>
> Could someone please give some hints on the way to find the  
> derivative on the curve at some points ?
See

	?smooth.spline
and
	?predict.smooth.spline

	cheers,

		Rolf Turner

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