iclocpoly: Interval-Censored Local Polynomial Regression Estimation

Description Usage Arguments Value Examples

Description

Local polynomial regression estimation for interval-censored data.

Usage

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iclocpoly(x, y=NULL, y.IC, degree=0, h, niter=10, kernel="normal", gridsize=401)

Arguments

x

uncensored explanatory variable vector

y

uncensored portion of response vector (optional)

y.IC

two-column matrix of left and right interval endpoints for censored responses

degree

degree of local polynomial

h

bandwidth

niter

number of iterations

kernel

smoothing kernel to be used; default is "normal"; other choices as in the function locpoly

gridsize

number of gridpoints; again as in locpoly

Value

A list consisting of the explanatory variable x and the imputed responses y as well as the estimate of sigma. Usually, one would apply locpoly with a similar bandwidth to obtain the final fitted model.

Examples

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library(KernSmooth)
data(motor.IC)
estimate <- iclocpoly(x=motor.IC$V1, y.IC = cbind(motor.IC$y.L, 
motor.IC$y.R), degree=0, h=1)
plot(motor.IC$V1, motor.IC$V2)
lines(locpoly(estimate$x, estimate$y, bandwidth=1, degree=0),col=4)


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