lf {locfit}  R Documentation 
Locfit term in Additive Model formula
Description
This function is used to specify a smooth term in a gam()
model formula.
This function is designed to be used with the SPlus
gam()
function. For R users, there are at least two different
gam()
functions available. Most current distributions of R
will include the mgcv
library by Simon Wood; lf()
is not compatable with this function.
On CRAN, there is a gam
package by Trevor Hastie, similar to
the SPlus version. lf()
should be compatable with this, although
it's untested.
Usage
lf(..., alpha=0.7, deg=2, scale=1, kern="tcub", ev=rbox(), maxk=100)
Arguments
... 
numeric predictor variable(s) 
alpha , deg , scale , kern , ev , maxk 
these are as in

See Also
locfit
,
locfit.raw
,
gam.lf
,
gam
Examples
## Not run:
# fit an additive semiparametric model to the ethanol data.
stopifnot(require(gam))
# The `gam' package must be attached _before_ `locfit', otherwise
# the following will not work.
data(ethanol, package = "lattice")
fit < gam(NOx ~ lf(E) + C, data=ethanol)
op < par(mfrow=c(2, 1))
plot(fit)
par(op)
## End(Not run)
[Package locfit version 1.59.10 Index]