Regression splines (parametric Smoothing splines (nonparametric The piecewise constant model (cont'd) 25 male 020 0.00 -005 20 的 Patrick Breheny STA 621:Nonparametric StatisticsIntroduction Regression splines (parametric) Smoothing splines (nonparametric) The piecewise constant model (cont’d) age spnbmd −0.05 0.00 0.05 0.10 0.15 0.20 10 15 20 25 female 10 15 20 25 male Patrick Breheny STA 621: Nonparametric Statistics