locfit           Local Regression and Likelihood, with model formula etc.
locfit.raw       Local Regression and Likelihood, with vector arguments.
hatmatrix        Compute hat matrix and weight diagrams.
kappa0           Simultaneous confidence band constants.
gcv		 Generalized cross validation scores.
aic		 Akaike Criterion.
locfit.robust	 Iterative robust local regression.
locfit.censor    Iterative censored local regression.
locfit.quasi     Iterative reweighted local regression.
plot.locfit 	 plot method for locfit object.
plotbyfactor     scatterplot, with plot symbols or colors coded by factor.
lines.locfit     Add fit to current plot.
print.locfit     print the locfit object.
knots            extract fit, standard errors etc at fit points.
predict.locfit   predict at new data points.
preplot.locfit   predict fit to new points, return object for ploting.
plot.locfitpred  plot objects produced by preplot.locfit.
summary.locfit   summary of fit.
residuals.locfit residuals.
fitted.locfit    fitted values.
rv               residual variance from locfit object.
rv<-             assign residual variance on locfit object
