Add parentheses under equations?
This is one possibility:
\documentclass[12pt,a4paper]{article}
\usepackage{amsmath}
\begin{document}
\begin{alignat*}{4}
&Y_t = {}&&\hat{\beta}_0 + {}&&\hat{\beta}_1 X_1 + \dots + {}&&\hat{\beta}_k X_k, \\
&(t) &&() && () &&()
\end{alignat*}
\end{document}
Another option using a new command,
\newcommand{\stacktwo}[2]{\begin{array}[t]{@{}c@{}}#1\\#2\end{array}}
can be like this:
\begin{equation}
\stacktwo{Y_t}{(t)} = \stacktwo{\hat{\beta}_0}{()} + \stacktwo{\hat{\beta}_1}{()} X_1 + \dots + \stacktwo{\hat{\beta}_k}{()} X_k,
\end{equation}
Also, you can load the stackengine
package and use the command \stackMath\stackunder{Y_t}{(t)}
, etc. from this package.
\documentclass[12pt,a4paper]{article}
\usepackage{amsmath,stackengine}
\stackMath
\renewcommand\useanchorwidth{T}
\renewcommand\stacktype{L}
\def\xbeta_#1{\stackunder{\beta_#1}{()}}
\begin{document}
\[
\stackunder{Y_t}{(t)} = \xbeta_0 + \xbeta_1 X_1 + \dots + \xbeta_k X_k,
\]
\end{document}
Here's a solution that uses the \underset
macro of the amsmath
package. In the following screenshot, the parenthetic material is centered below the corresponding \beta
particles (pun intended) in the preceding row. Simply adjust the closing curly braces if the parenthetic material should be centered on \beta_i X_
.
\documentclass{article}
\usepackage{mathtools}
\newcommand\under[2]{\underset{\mathclap{\textstyle(#1)}}{#2}}
\begin{document}
\[
\under{t}{Y_t} = \under{u}{\hat{\beta}_0}
+ \under{v}{\hat{\beta}_1} X_1
+ \dots
+ \under{wxyz}{\hat{\beta}_k} X_k
\]
\end{document}