\beta
can be used only in mathmode. Here is a way of coding – but I'm unsure of what is supposed to be maths formulae, what is supposed to be text. I use the cellspace
package to have a minimal distance between the top of the contents of a cell and the line above, and similarly between the bottom of the contents and the line below:
\documentclass[11pt, a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{mathtools, array, bm}
\DeclareMathOperator{\SSE}{SSE}
\usepackage[math]{cellspace}
\cellspacetoplimit=4pt
\cellspacebottomlimit=4pt
\usepackage{lmodern}
\begin{document}
\[ \renewcommand{\arraystretch}{1.5}
\begin{array}{ | *{4}{Sc|}}
\hline
\text{Modelo} & Gl & SC & F \\
\hline
\beta'=(\beta_0,\beta_1) & 2 & \beta'X'Y &
\dfrac{(\SSE_r-\SSE_c)/(k-g)}{\SSE_c/(n-[k+1])}\\
\text{Residual} & n-2 & Y'Y-\beta'X'Y & \\
\hline
\text{Total} & n & \bm{Y'Y} & \text{asd}\\
\hline
\end{array} \]
\end{document}
Result:
