https://weak-fox.github.io/2019/07/20/%E4%B8%80%E5%85%83%E7%BA%BF%E6%80%A7%E5%9B%9E%E5%BD%92/#rewardModal 一元线性回归回归模型参数估计最小二乘估计最小二乘估计(Least Square Estimation ,OLE):根据观察数据,寻找参数$\beta_0$,$\beta_1$的估计值$\hat{\beta_0}$,$\hat{\beta_1