group.npvarselec        Group variable selection for nonparametric
                        regression
localpoly.reg           Local Polynomial Regression Fitting
npmodelcheck            Hypothesis Testing for Covariate or Group
                        effect in Nonparametric Regression
npvarselec              Variable selection for covariates in
                        nonparametric regression
plot3d.localpoly.reg    3d plot from a local polynomial fit
