Table not fitting onto page

Question

I am having a problem with fitting a table on the page - the obvious problems are the long(ish) column titles, as well as the "Confidence Prediction" column.

\documentclass[11pt,a4paper,titlepage]{article}
\usepackage{booktabs}
\begin{document}
\begin{table}[!htbp] \centering 
\caption{Confusion Matrix - Logistic Regression.} 
\label{tab1} 
\begin{tabular*}{\linewidth}{@{\extracolsep{\fill}}lSSlSSl} 
\toprule 
& \multicolumn{3}{c}{Model 1 (No Regularisation)} & \multicolumn{3}{c}{Model 2 (With Regularisation)} \\
\cmidrule(lr){2-4} 
\cmidrule(lr){5-7}
& 0 & 1 & Correct Predictions (\%) & 0 & 1 & Correct Predictions (\%) \\
\midrule \\
0 & 414  & 70 & 85.5 & 419 & 65 & 86.4\\ 
\addlinespace
1 & 67 & 420 & 86.2 & 58 & 429 & 88.1 \\
\midrule
\textbf{Average} &  &  & \textbf{85.9} &  & & \textbf{87.3} \\
\bottomrule \\
\end{tabular*} 
\end{table} 

Answer 1

Here is my suggestion that is based on splitting too long column titles into two lines and using the table-format option to the S columns.

\documentclass[11pt,a4paper,titlepage]{article}
\usepackage{booktabs}
\usepackage{siunitx}
\usepackage{makecell}

\usepackage{etoolbox}
\robustify\bfseries

\begin{document}
\begin{table}[!htbp] \centering 
\caption{Confusion Matrix - Logistic Regression.} 
\label{tab1} 
\begin{tabular}{l
                S[table-format=3]
                S[table-format=3]
                S[table-format=2.1,detect-weight]
                S[table-format=3]
                S[table-format=3]
                S[table-format=2.1,detect-weight]} 
\toprule 
& \multicolumn{3}{c}{\makecell{Model 1 \\(No Regularisation)}} & \multicolumn{3}{c}{\makecell{Model 2 \\ (With Regularisation)}} \\
\cmidrule(lr){2-4} 
\cmidrule(lr){5-7}
& 0 & 1 & {\makecell{Correct\\ Predictions (\%)}} & 0 & 1 & {\makecell{Correct\\ Predictions (\%)}} \\
\midrule 
0 & 414  & 70 & 85.5 & 419 & 65 & 86.4\\ 
\addlinespace
1 & 67 & 420 & 86.2 & 58 & 429 & 88.1 \\
\midrule
\bfseries Average &  &  & \bfseries 85.9 &  & & \bfseries 87.3 \\
\bottomrule \\
\end{tabular} 
\end{table} 

\end{document}

• In order to split the column headings into two lines, I used makecell from the eponymous package.
• For a better formatting of the S colunns, I used the appropriate values for the table-format option. Additionally, I used S columns for the 4th and 7th column as well.
• In order to correct the alignment of the bold numbers in the last row, I used etoolbox's \robustify command in combination with \bfseries and the detect-weight option of the S columns.

Answer 2

Here's a solution that employs a tabularx environment, to allow automatic line-wrapping in the headers of columns 4 and 7. A centered version of the X column type is used for these two columns.

\documentclass[11pt,a4paper,titlepage]{article}
\usepackage{booktabs,tabularx,ragged2e,caption}
\newcolumntype{C}{>{\Centering\arraybackslash}X} % centered version of 'X' col.
\begin{document}
\begin{table}[!htbp]
\captionsetup{skip=0.333\baselineskip}
\caption{Confusion Matrix -- Logistic Regression.}  \label{tab1} 
\begin{tabularx}{\linewidth}{@{} l *{2}{rrC} @{}} 
\toprule 
& \multicolumn{3}{c}{Model 1} 
& \multicolumn{3}{c}{Model 2} \\
& \multicolumn{3}{c}{(No Regularisation)}
& \multicolumn{3}{c}{(With Regularisation)}\\
\cmidrule(lr){2-4} \cmidrule(l){5-7}
& 0 & 1 & \% Correct Predictions
& 0 & 1 & \% Correct Predictions \\
\midrule 
0 & 414  & 70 & 85.5 & 419 & 65 & 86.4\\ 
\addlinespace
1 & 67 & 420 & 86.2 & 58 & 429 & 88.1 \\
\midrule
\textbf{Average} &&& \textbf{85.9} &&& \textbf{87.3} \\
\bottomrule
\end{tabularx} 
\end{table} 
\end{document}

---

Addendum: If you don't need the table to span the full width of the textblock, a much more compact (and, in my opinion, better-looking) solution, which uses just the "standard" column types l, c, and r, is available:

\documentclass[11pt,a4paper,titlepage]{article}
\usepackage{booktabs,caption}
\begin{document}
\begin{table}[!htbp]
\centering
\captionsetup{skip=0.333\baselineskip}
\caption{Confusion Matrix -- Logistic Regression.} 
\label{tab1} 
\begin{tabular}{@{} l *{2}{rrc} @{}} 
\toprule 
& \multicolumn{3}{c}{Model 1} 
& \multicolumn{3}{c}{Model 2} \\
& \multicolumn{3}{c}{(No Regularisation)}
& \multicolumn{3}{c}{(With Regularisation)} \\
\cmidrule(lr){2-4} \cmidrule(l){5-7}
& 0 & 1 & \% Correct & 0 & 1 & \% Correct \\
&&& Predictions &&& Predictions \\
\midrule 
0 & 414 &  70 & 85.5 & 419 &  65 & 86.4\\ 
\addlinespace
1 &  67 & 420 & 86.2 &  58 & 429 & 88.1 \\
\midrule
\textbf{Average} &&& \textbf{85.9} &&& \textbf{87.3} \\
\bottomrule
\end{tabular} 
\end{table} 
\end{document}

Answer 3

I haven't siunitx on my system and used other columntypes... Feel free to use whatever you want (for example yours).

The idea is to break some cells every where needed.

(I used this answer: https://tex.stackexchange.com/a/19678/120578)

\documentclass{article}
\usepackage{array}
\usepackage{booktabs}
\usepackage{lipsum}
\newcommand{\specialcell}[2][c]{%
  \begin{tabular}[#1]{@{}c@{}}#2\end{tabular}}
\begin{document}
\lipsum[1-2]
\begin{table}[!htbp] \centering 
\caption{Confusion Matrix - Logistic Regression.} 
\label{tab1} 
\begin{tabular*}{\linewidth}{@{\extracolsep{\fill}}lrrrrrr} 
\toprule 
& \multicolumn{3}{c}{\specialcell{Model 1\\ (No Regularisation)}} & \multicolumn{3}{c}{\specialcell{Model 2 \\(With Regularisation)}} \\
\cmidrule(lr){2-4} 
\cmidrule(lr){5-7}
& 0 & 1 & \specialcell{Correct\\ Predictions (\%)} & 0 & 1 & \specialcell{Correct\\ Predictions (\%)} \\
\midrule \\
0 & 414  & 70 & 85.5 & 419 & 65 & 86.4\\ 
\addlinespace
1 & 67 & 420 & 86.2 & 58 & 429 & 88.1 \\
\midrule
\textbf{Average} &  &  & \textbf{85.9} &  & & \textbf{87.3} \\
\bottomrule \\
\end{tabular*} 
\end{table} 
\end{document}

Output: