radial_persp         R code for fitting and plotting a 3D perspective plot for the `radial' function
radial_rgl           R code for fitting and generating a 3D real-time rendering plot for the `radial' function using OpenGL
nomad_factor         R code for testing NOMAD for factor regression splines
nomad_kernel         R code for testing NOMAD for categorical regression splines
crsiv                R code for testing crsiv with one endogenous predictor, no exogenous predictors
crsiv_exog           R code for testing crsiv with one endogenous and one exogenous predictor
crsiv_exog_persp     R code for testing crsiv with one endogenous and one exogenous predictor then plotting results in a perspective plot
