Regression splines (parametric) Smoothing splines (nonparametric Quadratic splines 20 25 male 020 015 0.05 0.00 -0.05 20 的日 Patrick Breheny STA 621:Nonparametric StatisticsIntroduction Regression splines (parametric) Smoothing splines (nonparametric) Quadratic splines 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