How to make table in the center of whole page

Question

I'm new to Latex. The following is my latex code. The emnlp2017 package in the example can be downloaded from here.

%\title{emnlp 2017 instructions}
% File emnlp2017.tex
\documentclass[11pt,letterpaper]{article}
\usepackage{emnlp2017}
\usepackage{times}
\usepackage{latexsym}
\usepackage{graphicx}
\usepackage{amsthm}
\usepackage{booktabs}
\usepackage{tabularx} % in the preamble
\usepackage{amsmath} 
\usepackage{url}
\usepackage{subfigure}
\usepackage{makecell}
\usepackage{subfigure}
\usepackage{multirow}
\usepackage{amsfonts}
\usepackage{booktabs}
\usepackage{siunitx}

\theoremstyle{definition}
%\newtheorem{exmp}{Example}[section]
% Uncomment this line for the final submission:
%\emnlpfinalcopy

%  Enter the EMNLP Paper ID here:
\def\emnlppaperid{***}

% To expand the titlebox for more authors, uncomment
% below and set accordingly.
% \addtolength\titlebox{.5in}    

\newcommand\BibTeX{B{\sc ib}\TeX}

\title{}

% Author information can be set in various styles:
% For several authors from the same institution:
% \author{Author 1 \and ... \and Author n \\
%         Address line \\ ... \\ Address line}
% if the names do not fit well on one line use
%         Author 1 \\ {\bf Author 2} \\ ... \\ {\bf Author n} \\
% For authors from different institutions:
% \author{Author 1 \\ Address line \\  ... \\ Address line
%         \And  ... \And
%         Author n \\ Address line \\ ... \\ Address line}
% To start a seperate ``row'' of authors use \AND, as in
% \author{Author 1 \\ Address line \\  ... \\ Address line
%         \AND
%         Author 2 \\ Address line \\ ... \\ Address line \And
%         Author 3 \\ Address line \\ ... \\ Address line}
% If the title and author information does not fit in the area allocated,
% place \setlength\titlebox{<new height>} right after
% at the top, where <new height> can be something larger than 2.25in
\author{}
\date{2017-03-07}
\begin{document}
\maketitle

\begin{abstract}

\end{abstract}

\section{Introduction}

% Table generated by Excel2LaTeX from sheet 'Sheet1'
\begin{table}[htbp]
  \centering
  \caption{AUC Result}
    \begin{tabular}{|c|c|r|r|r|r|r|r|}
    \hline
          &       & \multicolumn{3}{c}{\textbf{twitter}} \vline & \multicolumn{3}{c}{\textbf{blog}} \\\hline 
    \textbf{classifier} & \textbf{data} & \multicolumn{1}{c}{\textbf{BOW}} \vline& \multicolumn{1}{c}{\textbf{CBOW}} \vline& \multicolumn{1}{c}{\textbf{SG}} \vline& \multicolumn{1}{c}{\textbf{BOW}} \vline& \multicolumn{1}{c}{\textbf{CBOW}} \vline& \multicolumn{1}{c}{\textbf{SG}} \\\hline 
    \multirow{2}[0]{*}{NB} & mean  &       &       &       &       &       &  \\
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}[0]{*}{RF} & mean  &       &       &       &       &       &  \\
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}[0]{*}{KNN} & mean  &       &       &       &       &       &  \\
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}[0]{*}{RBFSVM} & mean  &       &       &       &       &       &  \\
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}[0]{*}{LinearSVM} & mean  &       &       &       &       &       &  \\
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}[0]{*}{SigmoidSVM} & mean  &       &       &       &       &       &  \\
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}[0]{*}{LR} & mean  &       &       &       &       &       &  \\
          & var   &       &       &       &       &       &  \\\hline 
    \end{tabular}%
  \label{tab:addlabel}%
\end{table}%

\section{Conclusion and Future work}

\bibliography{emnlp2017}
\bibliographystyle{emnlp_natbib}

\end{document}

the result is

it is out of boundary right side, How to solve it? I want to make this table in the center of the whole page so that avoid overflow, how to make it?

Also, i want to add horizontal line separating mean and var from column "data" to the end, how to do it?

Thank you!

Answer 1

If you want a table not necessarily at the top of the page, you can use the strip environment from cuted.

I simplified your table code for column heads, using the \thead command, from makecell. Also, note times is obsolete, as it does not have support for maths. So I replaced it with the newtx package, based on the Times clone TeX Gyre Termes. The subfigure package is obsolete too, and no more developed. I replaced it with the subcaption package, which defines a subfigure environment.

Last point, I gave a more professional look to your table, using the rules from booktabs and no vertical rules. I differentiated the mean and var rows using colour, instead of a separating rule.

%\title{emnlp 2017 instructions}
% File emnlp2017.tex
\documentclass[11pt, letterpaper, svgnames, table]{article}
\usepackage{emnlp2017}
\usepackage{amsthm}
\usepackage{newtxmath, newtxtext}
\usepackage{graphicx}
\usepackage{booktabs}
\usepackage{tabularx} % in the preamble
\usepackage{amsmath}
\usepackage{url}
\usepackage{subcaption}
\usepackage{makecell}
\usepackage{multirow}
\usepackage{amsfonts}
\usepackage{booktabs}
\usepackage{siunitx}
\usepackage{cuted, caption}

\theoremstyle{definition}
%\newtheorem{exmp}{Example}[section]
% Uncomment this line for the final submission:
%\emnlpfinalcopy

% Enter the EMNLP Paper ID here:
\def\emnlppaperid{***}

% To expand the titlebox for more authors, uncomment
% below and set accordingly.
% \addtolength\titlebox{.5in}

\newcommand\BibTeX{B{\sc ib}\TeX}

\title{}

\author{}
\date{2017-03-07}
   \usepackage{lipsum}
\setlength{\stripsep}{8pt}
\setlength{\abovecaptionskip}{0pt}

\renewcommand\theadfont{\normalsize\bfseries}

 \begin{document}

\lipsum[1-2]
%
\begin{strip}
 \centering\setlength\defaultaddspace{1.5ex}%
 \captionof{table}{Result}\label{tab:addlabel}%
\rowcolors{3}{Gainsboro!50! Lavender!40! }{}
       \begin{tabular}{ cc*{6}{r}}
        \hline
              & & \multicolumn{3}{c}{\textbf{twitter}} & \multicolumn{3}{c}{\textbf{blog}} \\
\cmidrule(lr){3-5}\cmidrule(lr){6-8}
        \textbf{classifier} & \textbf{data} & \thead{BOW} & \thead{CBOW} & \thead{SG} & \thead{BOW} & \thead{CBOW} & \thead{SG} \\\midrule
        \cellcolor{white}\multirow{2}[0]{*}{NB} & mean & & & & & & \\
              & var & & & & & & \\\addlinespace
        \cellcolor{white}\multirow{2}[0]{*}{RF} & mean & & & & & & \\
              & var & & & & & & \\\addlinespace
        \cellcolor{white}\multirow{2}[0]{*}{KNN} & mean & & & & & & \\
              & var & & & & & & \\\addlinespace
        \cellcolor{white}\multirow{2}[0]{*}{RBFSVM} & mean & & & & & & \\
              & var & & & & & & \\\addlinespace
        \cellcolor{white}\multirow{2}[0]{*}{LinearSVM} & mean & & & & & & \\
              & var & & & & & & \\\addlinespace
        \cellcolor{white}\multirow{2}[0]{*}{SigmoidSVM} & mean & & & & & & \\
              & var & & & & & & \\\addlinespace
        \cellcolor{white}\multirow{2}[0]{*}{LR} & mean & & & & & & \\
              & var & & & & & & \\\bottomrule
        \end{tabular}%
\end{strip}
%
\lipsum[3-4]

\end{document} 

Answer 2

Use the starred version of table* and add \cline{2-8} to make the separators.

\begin{table*}[htbp] 
  \centering
  \caption{AUC Result}
    \begin{tabular}{|c|c|r|r|r|r|r|r|}
    \hline
          &       & \multicolumn{3}{c|}{\textbf{twitter}}  & \multicolumn{3}{c|}{\textbf{blog}} \\\hline 
    \textbf{classifier} & \textbf{data} & \multicolumn{1}{c|}{\textbf{BOW}} & \multicolumn{1}{c|}{\textbf{CBOW}} & \multicolumn{1}{c|}{\textbf{SG}} & \multicolumn{1}{c|}{\textbf{BOW}} & \multicolumn{1}{c|}{\textbf{CBOW}} & \multicolumn{1}{c|}{\textbf{SG}} \\\hline 
    \multirow{2}{*}{NB} & mean  &       &       &       &       &       &  \\ \cline{2-8}
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}{*}{RF} & mean  &       &       &       &       &       &  \\ \cline{2-8}
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}{*}{KNN} & mean  &       &       &       &       &       &  \\ \cline{2-8}
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}{*}{RBFSVM} & mean  &       &       &       &       &       &  \\ \cline{2-8}
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}{*}{LinearSVM} & mean  &       &       &       &       &       &  \\ \cline{2-8}
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}{*}{SigmoidSVM} & mean  &       &       &       &       &       &  \\ \cline{2-8}
          & var   &       &       &       &       &       &  \\\hline 
    \multirow{2}{*}{LR} & mean  &       &       &       &       &       &  \\ \cline{2-8}
          & var   &       &       &       &       &       &  \\\hline 
    \end{tabular}%
  \label{tab:addlabel}%
\end{table*}%