1
\documentclass{article}
\usepackage{mathtools,amssymb}

\begin{document}

\begin{gather}    
\begin{split}

(1-\underset{(0.034)}{0.060}{\textit{B}}^{12}-\underset{(0.032)}{0.123}{\textit{B}}^{2(12)}){y}_t &=(1-\underset{(0.016)}{0.878}\textit{B}^{12})(1-\underset{(0.012)}{0.969}\textit{B}){e}_t\\ 

\end{split}

\notag\\

Box-Ljung \quad test \quad for\quad residuals\quad {\chi}^2= 15.151 \quad df= 12 \quad p-value = 0.233 \notag\\

\CENTERLINE {(Standard\quad errors\quad in\quad parentheses)}\notag

\end{gather} 

\end{document}   
  • 1
    Welcome to TeX.SX! Please make your code compilable (if possible), or at least complete it with \documentclass{...}, the required \usepackage's, \begin{document}, and \end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to give you a hand. Help them help you: remove that one hurdle between you and a solution to your problem. – Martin Schröder Jun 15 '17 at 0:24
2

Don't use blank lines in math mode, post a complete MWE, and please don't tell me that Box-Ljung is still being taught......

\documentclass{article}
\usepackage{mathtools,amssymb}

\begin{document}

\begin{gather}    
\begin{split}
(1-\underset{(0.034)}{0.060}{\textit{B}}^{12}-\underset{(0.032)}{0.123}{\textit{B}}^{2(12)}){y}_t &=(1-\underset{(0.016)}{0.878}\textit{B}^{12})(1-\underset{(0.012)}{0.969}\textit{B}){e}_t\\ 
\end{split}
\notag\\
\text{Box-Ljung \quad test \quad for\quad residuals}\quad {\chi}^2= 15.151 \quad df= 12 \quad p-value = 0.233 \notag\\
%\CENTERLINE 
{\text{(Standard errors in parentheses)}}\notag
\end{gather} 

\end{document}
  • I'm sorry I really new to Latex, I dont understant what do u mean by "post a complete MWE" – Yasmine Abdelfattah Jun 15 '17 at 0:45
  • Minimal working example. Short code that starts with \documentclass and people can cut and paste and then run verbatim. – JPi Jun 15 '17 at 0:50
  • You did it!.... – JPi Jun 15 '17 at 0:51

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