Graphics, Figures & Tables ⇒ Problem with equation in table

[mexxwel]

Hey there!

I'd like to create a table with two parameters and the corresponding equation.
Somehow Latex gives me the error: '! Missing $ inserted.' and I don't know what that means...

Code: Select all

\begin{table}[H]
\centering
\caption{XXX}
\label{tab:XXX}
\begin{adjustbox}{max width=\textwidth}
	\begin{tabular}{c c}
	\hline\hline
	\vspace{0.25cm}
	Parameter & Mathematical Equation \\	\hline 
	\vspace{0.25cm}
	Standard Deviation & \sigma=\sqrt{\frac{\sum(X-\mu)$^2$}{N}} \\
	\vspace{0.25cm}
	Variance & \sigma^2=\frac{\sum(X-\mu)$^2$}}{N} \\
	\\ \hline
	\end{tabular}
\end{adjustbox}
\end{table}

Thanks for your help!

[Johannes_B]

Welcome,

you put only the superscript in mathmode, but the whole equation needs to be in mathmode. Below, an example that sets the second column in math mode as a whole.

Code: Select all

\documentclass{article}
\usepackage{mathtools}
\usepackage{booktabs}
\usepackage{array}
\setlength{\defaultaddspace}{.75em}
\begin{document}
\begin{tabular}{c >{$\displaystyle}c<{$}}
			\toprule
			Parameter          & $Mathematical Equation$ \\
			\midrule
			Standard Deviation & \sigma=\sqrt{\frac{\sum(X-\mu)^2}{N}} \\\addlinespace
			Variance           & \sigma^2=\frac{\sum(X-\mu)^2}{N} \\
			\bottomrule
		\end{tabular}
\end{document}