# How to construct a confusion matrix in LaTeX?

A confusion matrix looks like:

Is there an easy way to do the same using LaTeX?

Otherwise I could just create a diagram with any software.

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@kkudi: The figure I attached is what you want to refer? – xport Jun 8 '11 at 16:28
Perhaps you can adapt the example for sfgame.sty for you purposes. Also you may want to delete your duplicate post at Stack Overflow since this question is more on topic here. – N.N. Jun 8 '11 at 16:52
it sounds too time-consuming. thanks for your comments. I'm going to create one using OmniGraffle. Cheers. – kkudi Jun 8 '11 at 17:18
You may also wanna have a look at this LaTeX community post. – N.N. Jun 8 '11 at 17:25
Since you have some responses below that seem to answer your question, please consider marking one of them as ‘Accepted’ by clicking on the tickmark below their vote count. This shows which answer helped you most, and it assigns reputation points to the author of the answer (and to you!). – Torbjørn T. Jun 10 '11 at 21:34

Here's a solution without TikZ:

\documentclass{article}
\usepackage{array}
\usepackage{multirow}

\newcommand\MyBox[2]{
\fbox{\lower0.75cm
\vbox to 1.7cm{\vfil
\hbox to 1.7cm{\hfil\parbox{1.4cm}{#1\\#2}\hfil}
\vfil}%
}%
}

\begin{document}

\noindent
\renewcommand\arraystretch{1.5}
\setlength\tabcolsep{0pt}
\begin{tabular}{c >{\bfseries}r @{\hspace{0.7em}}c @{\hspace{0.4em}}c @{\hspace{0.7em}}l}
\multirow{10}{*}{\parbox{1.1cm}{\bfseries\raggedleft actual\\ value}} &
& \multicolumn{2}{c}{\bfseries Prediction outcome} & \\
& & \bfseries p & \bfseries n & \bfseries total \\
& p$'$ & \MyBox{True}{Positive} & \MyBox{False}{Negative} & P$'$ \\[2.4em]
& n$'$ & \MyBox{False}{Positive} & \MyBox{True}{Negative} & N$'$ \\
& total & P & N &
\end{tabular}

\end{document}


In a comment it has been requested to rotate one of the labels; this can be easily done using \rotatebox from graphicx:

\documentclass{article}
\usepackage{array}
\usepackage{graphicx}
\usepackage{multirow}

\newcommand\MyBox[2]{
\fbox{\lower0.75cm
\vbox to 1.7cm{\vfil
\hbox to 1.7cm{\hfil\parbox{1.4cm}{#1\\#2}\hfil}
\vfil}%
}%
}

\begin{document}

\noindent
\renewcommand\arraystretch{1.5}
\setlength\tabcolsep{0pt}
\begin{tabular}{c >{\bfseries}r @{\hspace{0.7em}}c @{\hspace{0.4em}}c @{\hspace{0.7em}}l}
\multirow{10}{*}{\rotatebox{90}{\parbox{1.1cm}{\bfseries\centering actual\\ value}}} &
& \multicolumn{2}{c}{\bfseries Prediction outcome} & \\
& & \bfseries p & \bfseries n & \bfseries total \\
& p$'$ & \MyBox{True}{Positive} & \MyBox{False}{Negative} & P$'$ \\[2.4em]
& n$'$ & \MyBox{False}{Positive} & \MyBox{True}{Negative} & N$'$ \\
& total & P & N &
\end{tabular}

\end{document}


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very good. It looks like that a lot users think that TikZ is needed for every problem ... By the way, you can use \parbox[c][1.7cm][c]{1.7cm}{...} – Herbert Jun 9 '11 at 6:51
@Herbert: Indeed. – TH. Jun 9 '11 at 12:29
@Herbert: thanks. And yes, you're absolutely right. – Gonzalo Medina Jun 9 '11 at 13:33
How can we rotate actual value by 90 degrees? – Rasoul Sep 14 '13 at 19:47
@Rasoul please see my updated answer. – Gonzalo Medina Sep 14 '13 at 20:31

It's quite easy making such a thing with TikZ, once you get the hang of it.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}[
box/.style={draw,rectangle,minimum size=2cm,text width=1.5cm,align=left}]
\matrix (conmat) [row sep=.1cm,column sep=.1cm] {
\node (tpos) [box,
label=left:$$\mathbf{p'}$$,
label=above:$$\mathbf{p}$$,
] {True \\ positive};
&
\node (fneg) [box,
label=above:\textbf{n},
label=above right:\textbf{total},
label=right:$$\mathrm{P}'$$] {False \\ negative};
\\
\node (fpos) [box,
label=left:$$\mathbf{n'}$$,
label=below left:\textbf{total},
label=below:P] {False \\ positive};
&
\node (tneg) [box,
label=right:$$\mathrm{N}'$$,
label=below:N] {True \\ negative};
\\
};
\node [left=.05cm of conmat,text width=1.5cm,align=right] {\textbf{actual \\ value}};
\node [above=.05cm of conmat] {\textbf{prediction outcome}};
\end{tikzpicture}
\end{document}


To rotate actual value you can replace

\node [left=.05cm of conmat,text width=1.5cm,align=right] {\textbf{actual \\ value}};


with

 \node [rotate=90,left=.05cm of conmat,anchor=center,text width=1.5cm,align=center] {\textbf{actual \\ value}};


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Adopting your code to another example, I can't help but notice that the baseline of the "p" above "True positive" is higher than "n"'s. Doesn't hurt much here, but looks weird when you have longer labels such as "low", "medium", and "high". Any ideas on this? (Thanks, btw.) – sr_ Jun 24 at 11:36
@sr_ Good point. You can add every label/.style={text depth=\depthof{p}} to the tikzpicture options. – Torbjørn T. Jun 24 at 11:40
Oh thanks a lot, this is perfect :) – sr_ Jun 26 at 7:10

Here is some LaTeX code I used to produce related tables for a tutorial. It might get you close to what you're looking for, although you'll probably want to change the layout.

\begin{tabular}{l|l|c|c|c}
\multicolumn{2}{c}{}&\multicolumn{2}{c}{True diagnosis}&\\
\cline{3-4}
\multicolumn{2}{c|}{}&Positive&Negative&\multicolumn{1}{c}{Total}\\
\cline{2-4}
\multirow{2}{*}{Screening test}& Positive & $a$ & $b$ & $a+b$\\
\cline{2-4}
& Negative & $c$ & $d$ & $c+d$\\
\cline{2-4}
\multicolumn{1}{c}{} & \multicolumn{1}{c}{Total} & \multicolumn{1}{c}{$a+c$} & \multicolumn{\
1}{c}{$b+d$} & \multicolumn{1}{c}{$N$}\\
\end{tabular}


% need the pifont package
\begin{tabular}{l|l|>{\columncolor{gray!20}}l|l|l}
%\begin{tabular}{l|l|l|l|l}
\multicolumn{2}{c}{}&\multicolumn{2}{c}{True diagnosis}&\\
\cline{3-4}
\multicolumn{2}{c|}{}&\multicolumn{1}{c|}{Positive}&\multicolumn{1}{c|}{Negative}&\multicolu\
mn{1}{c}{}\\
%\cline{2-4}
\hhline{~|---}
\multirow{2}{*}{Screening test}& Positive & TP & FP ($\alpha$) &\ding{214} PPV\\
%\cline{2-4}
\hhline{~|---}
& Negative & FN ($\beta$) & TN & \ding{214} NPV\\
%\cline{2-4}
\hhline{~|---}
\multicolumn{1}{c}{} & \multicolumn{1}{c}{} &
\multicolumn{1}{c}{\multirow{2}{*}{\parbox{2em}{\vskip1ex\ding{215}\\ Se}}} & \multicolumn{1\
}{c}{\multirow{2}{*}{\parbox{2em}{\vskip1ex\ding{215}\\ Sp}}} &\multicolumn{1}{c}{}\\
\end{tabular}


-

The line:

\multicolumn{1}{c}{} & \multicolumn{1}{c}{Total} & \multicolumn{1}{c}{$a+c$} & \multicolumn{\
1}{c}{$b+d$} & \multicolumn{1}{c}{$N$}\\


needs to be corrected to

\multicolumn{1}{c}{} & \multicolumn{1}{c}{Total} & \multicolumn{1}{c}{$a+c$} & \multicolumn{
1}{c}{$b+d$} & \multicolumn{1}{c}{$N$}\\


in order to compile...

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Hi Christian welcome to the site. Often we don't follow-up with such commentary, to keep things self-contained. Which line in which answer are you writing about ? Also you can click edit under an answer and suggest an edit after a few users review it it would be added to the answer if it is sound. – percusse May 31 at 15:13
When you have enough reputation, you'll be able to leave comments / submit edit suggestions for others' posts. As it stands, I think this answer will be converted to a comment or edit soon. Aside, I don't exactly see a difference except for escaping a space, which is (AFAIK) unnecessary. – Sean Allred May 31 at 15:14
@percusse Take a look at this answer: tex.stackexchange.com/a/20295/17423 to be fair, it does need some work to be a 'good' example. – Sean Allred May 31 at 15:16
@SeanAllred I meant the answer needs to point that out. – percusse May 31 at 15:17
@percusse naturally :) but I want to point out to OP that normally, answers are reserved for complete, self-contained answers. Stuff like this should just be a comment or a straight-up edit. – Sean Allred May 31 at 15:17