locfit (version 1.1-11)

preplot.locfit: Prediction from a Locfit object.

Description

preplot.locfit can be called directly, although it is more usual to call plot.locfit or predict.locfit. The advantage of preplot.locfit is in S-Plus 5, where arithmetic and transformations can be performed on the "preplot.locfit" object.

plot(preplot(fit)) is essentially synonymous with plot(fit).

Usage

## S3 method for class 'locfit':
preplot(object, newdata, where, tr=NULL, what="coef",
  band="none", get.data=FALSE, f3d=FALSE, ...)

Arguments

object

Fitted object from locfit().

newdata

Points to predict at. Can be given in several forms: vector/matrix; list, data frame.

where

An alternative to newdata. Choices include "grid" for the grid lfmarg(object); "data" for the original data points and "fitp" for the direct fitting po

tr

Transformation for likelihood models. Default is the inverse of the link function.

what

What to compute predicted values of. The default, what="coef", works with the fitted curve itself. Other choices include "nlx" for the length of the weight diagram; "infl" for the influence function; "ban

band

Compute standard errors for the fit and include confidence bands on the returned object. Default is "none". Other choices include "global" for bands using a global variance estimate; "local" for bands using a l

get.data

If TRUE, the original data is attached to the returned object, and added to the plot.

f3d

If TRUE, sets a flag that forces ploting using the trellis style. Not available in R.

...

not used.

Value

• An object with class "preplot.locfit", containing the predicted values and additional information used to construct the plot.

See Also

locfit, predict.locfit, plot.locfit.