How to create a multirow table [closed] - latex

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I am trying to make a multirow table in LaTeX which looks like the true positive, true negative, etc table shown in this Wikipedia article.
I am trying to use multirow, but I'm not sure how to get the y hat to be 'outside' the table.
\begin{table}[tbh!]
\centering
\begin{tabular}{|l|l|l|}
\multicolumn{3}{c}{$y$} \\ \hline
%\multirow{3}{*}{$\hat{y}$} \\
& \textbf{T} & \textbf{F} \\ \hline
\textbf{T} & TP & FP \\ \hline
\textbf{F} & FN & TN \\ \hline
\end{tabular}
\caption{Truth and prediction comparison.}
\label{tab:revpol}
\end{table}
Can anyone explain what I need to change here to achieve this?

Answer 1

It's easiest to include the "out of table" components as part of the tabular structure:
\documentclass{article}
\usepackage{multirow}% http://ctan.org/pkg/multirow
\begin{document}
\begin{table}[t]
\centering
\begin{tabular}{l|l|l|l|}
\multicolumn{2}{c}{} & \multicolumn{2}{c}{$y$} \\ \cline{3-4}
\multicolumn{2}{c|}{} & \textbf{T} & \textbf{F} \\ \cline{2-4}
\multirow{2}{*}{$\hat{y}$} & \textbf{T} & TP & FP \\ \cline{2-4}
& \textbf{F} & FN & TN \\ \cline{2-4}
\end{tabular}
\caption{Truth and prediction comparison.}
\label{tab:revpol}
\end{table}
\end{document}
\clines are meant to put an \hline only in certain columns. \multicolumn is used to hide some of the vertical lines inserted using your tabular column specification.
On a side note, consider booktabs as a tabular representation alternative.