Angular Term for a Locfit model.
The ang() function is used in a locfit model formula
to specify that a variable should be treated as an angular
or periodic term. The scale argument is used to
set the period.
ang(x) is equivalent to lp(x,style="ang").
ang(x,...)
x |
numeric variable to be treated periodically. |
... |
Other arguments to |
Loader, C. (1999). Local Regression and Likelihood. Springer, NY (Section 6.2).
# generate an x variable, and a response with period 0.2 x <- seq(0,1,length=200) y <- sin(10*pi*x)+rnorm(200)/5 # compute the periodic local fit. Note the scale argument is period/(2pi) fit <- locfit(y~ang(x,scale=0.2/(2*pi))) # plot the fit over a single period plot(fit) # plot the fit over the full range of the data plot(fit,xlim=c(0,1))
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