### 平滑splines

$\mathcal{F}$为函数族$a=x_{0}<\cdots上的分段三次多项式（splines），且在首尾两段$[x_{0},x_{1}]$[x_{n},x_[......]

### ≪统计学习精要(The Elements of Statistical Learning)≫课堂笔记（三）

I hate CS people. They don't know linear algebra but want to teach projective geometry. They don't know any probability but want to use graphical models. They don't understand stats at all but still do machine learning like crazy.

### ≪统计学习精要(The Elements of Statistical Learning)≫课堂笔记（二）

------------原谅我的废话，笔记开始------------

### 简单预测方法：最小二乘法（以下沿用计量经济学的习惯，简称OLS）

OLS实在是太普遍了，我就不赘述细节了。OLS的思想就是，基于已有的样本信息，找出[......]