cpar {locfit} | R Documentation |
Conditionally parametric term for a Locfit model.
Description
A term entered in a locfit
model formula using
cpar
will result in a fit that is conditionally parametric.
If the formula is y~x1+cpar(x2)
, the resulting surface,
for fixed x1
, will be quadratic (using the default deg=2
)
in x2
. Note that the coefficients of the quadratic may depend
on x1
; this distinguishes a conditionally parametric model
from a semiparametric model.
Usage
cpar(x)
Arguments
See Also
locfit
Examples
data(ethanol)
# fit a conditionally parametric model
fit <- locfit(NOx~E+cpar(C),data=ethanol)
plot(fit)
# one way to force a parametric fit with locfit
fit <- locfit(NOx~cpar(E),data=ethanol)
[Package
locfit version 1.1-11
Index]