ang | Angular Term for a Locfit model. | ang |
locfit(y~ang(x), scale=1/(2*pi))
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 of locfit() is used to set the period.
# 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))
Loader, C. (1999). Local Regression and Likelihood. Springer, NY (Section 6.2).
locfit.
models
Locfit Home | Help Index |