bda (version 1.2.7-31)

lpreg: Local polynomial regression

Description

Local polynomial regression.

Usage

lpreg(x, y, bandwidth, gridsize = 256L, degree = 1L,
                  kernel="gaussian", error = NULL, range.x, na.rm =
                  TRUE, binned = FALSE)

Arguments

x,y

vectors of predictor and response variable.

bandwidth

the kernel bandwidth smoothing parameter. Larger values of bandwidth make smoother estimates, smaller values of bandwidth make less smooth estimates.

gridsize

The size of grid where the density will be evaluated.

degree

Degree of local polynomial regression.

kernel

Kernel selection. Default: normal

error

Measurement error type. Reserved

na.rm

logical; if TRUE, missing values are removed from x and weights. If FALSE any missing values cause an error.

range.x

vector containing the minimum and maximum values of x at which to compute the estimate. The default is the minimum and maximum data values, extended by the support of the kernel.

binned

Have the data been binned. Default: FALSE.

See Also

lprde, histolpr.

Examples

ofc0 = rnorm(1000,34.5,1.5)
      ofc = round(ofc0)
      x0 = seq(28,42, length=100)
      f0 = dnorm(x0, 34.5, 1.5)
      plot(x0, f0, type='l', col=2)

      out0 = lprde(ofc0, bandwidth=.25)
      lines(out0, col=4, lty=2)
      
      out1 = lprde(ofc, binned=TRUE,bandwidth=1)
      lines(out1, col=1, lty=2)
      
      bdat = binning(ofc0)
      out3 = lpreg(bdat$x, bdat$y, binned=TRUE, bandwidth=.3)
      lines(out3, col=4, lwd=3)