locfit (version 19980714-2)

locfit: Local Regression, Likelihood and Density Estimation.

Usage

locfit(formula, data, weights, cens, base, subset, geth, ..., lfproc)

Arguments

formula

Model Formula; e.g. y~x for a regression model; ~x for a density estimation model

data

Data Frame.

weights

Prior weights (or sample sizes) for individual observations. This is typically used where observations have unequal variance.

cens

Censoring indicator. 1 (or TRUE) denotes a censored observation. 0 (or FALSE) denotes uncensored.

base

Baseline for local fitting. For local regression models, specifying a base is equivalent to using y-base as the reponse. But base also works for local likelihood.

subset

Subset observations in the data frame.

geth

Don't use.

...

Other arguments to locfit.raw() (or the lfproc).

lfproc

A processing function to compute the local fit. Default is locfit.raw(). Other choices include locfit.robust(), locfit.censor() and locfit.quasi().

Value

• An object with class "locfit". A standard set of methods for printing, ploting, etc. these objects is provided. locfit() is a model-formula based front end to locfit.raw().

References

Consult the Web page http://cm.bell-labs.com/stat/project/locfit/.

See Also

locfit.raw

Examples

data(ethanol)
locfit(NOx~E,data=ethanol)