LOCFIT: R and S-Plus Help

lcvplot(..., alpha)

The lcvplot function loops through calls to the lcv function (and hence to linklocfit), using a different smoothing parameter for each call. The returned structure contains the likelihood cross validation statistic for each fit, and can be used to produce an LCV plot.

...

arguments to the lcv, locfit functions.

alpha

Matrix of smoothing parameters. The aicplot function loops through calls to lcv, using each row of alpha as the smoothing parameter in turn. If alpha is provided as a vector, it will be converted to a one-column matrix, thus interpreting each component as a nearest neighbor smoothing parameter.

An object with class "gcvplot", containing the smoothing parameters and LCV scores. The actual plot is produced using plot.gcvplot.

data(ethanol)
plot(lcvplot(NOx~E,data=ethanol,alpha=seq(0.2,1.0,by=0.05)))

locfit, locfit.raw, gcv, lcv, plot.gcvplot

htest