The package bspline, downloadable from SSC, now has 3 modules. The first, bspline, generates a basis of Schoenberg B-splines. The second, frencurv, generates a basis of reference splines, whose parameters in the regression model are simply values of the spline at reference points on the Xaxis. The recent addition, flexcurv, is an easy–to–use version of frencurv, and generates reference splines ...