orígen TeX:

\overset{\wedge}{\underset{\sim}{\beta}}=\left(\begin{array}{ccccc}\hat{\beta_{0}}\\\hat{\beta_{1}}\\\hat{\beta_{2}}\\\vdots\\\hat{\beta_{p}}\end{array}\right)=\left(\begin{array}{ccccc}x_{11} & x_{21} & x_{31} & \cdots & x_{n1}\\x_{21} & x_{22} & x_{32} & \cdots & x_{n2}\\x_{13} & x_{23} & x_{33} & \cdots & x_{n3}\\\vdots & \vdots & \vdots & \ddots & \vdots\\x_{1p} & x_{2p} & x_{3p} & \cdots & x_{np}\end{array}\right)\left(\begin{array}{ccccc}x_{11} & x_{12} & x_{13} & \cdots & x_{1p}\\x_{21} & x_{22} & x_{23} & \cdots & x_{2p}\\x_{31} & x_{32} & x_{33} & \cdots & x_{3p}\\\vdots & \vdots & \vdots & \ddots & \vdots\\x_{n1} & x_{n2} & x_{n3} & \cdots & x_{np}\end{array}\right)\left(\begin{array}{ccccc}y_{1}\\y_{2}\\y_{3}\\\vdots\\y_{n}\end{array}\right)