Locfit term in Additive Model formula
This function is used to specify a smooth term in a gam()
model formula.
This function is designed to be used with the S-Plus
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 S-Plus version. lf() should be compatable with this, although
it's untested.
lf(..., alpha=0.7, deg=2, scale=1, kern="tcub", ev=rbox(), maxk=100)
... |
numeric predictor variable(s) |
alpha, deg, scale, kern, ev, maxk |
these are as in
|
locfit,
locfit.raw,
gam.lf,
gam
## 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)
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