\begin{sidewaystable}有人能帮我调整一下大表格吗？无论你想使用还是都没关系\begin{table}。表格太大了，我看不清单元格里面的内容。你能帮我调整一下表格吗？
我的尝试：
\documentclass[12pt]{article}
\usepackage{eurosym}
\usepackage{hyperref}
\usepackage{amsthm}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{color}
\usepackage{graphicx}
\usepackage{float}
\usepackage{subfigure}
\usepackage{indentfirst}
\usepackage{bm}
\usepackage{graphicx} %---> %---> %---> DO NOT ALTER THIS COMMAND
\usepackage{amsmath}
\usepackage{makecell, multirow}
\usepackage{longtable}% http://ctan.org/pkg/rotating
\usepackage{adjustbox}
\usepackage{float}
\usepackage{eurosym}
\usepackage{hyperref}
\usepackage{amsthm}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{color}
\usepackage{subfigure}
\usepackage{indentfirst}
\usepackage{bm}
\usepackage{booktabs}
\usepackage{amsmath}
\usepackage{csvsimple}
\usepackage{amssymb}
\usepackage{longtable}
\usepackage{booktabs}
\usepackage{rotating}
\usepackage{rotfloat}
\usepackage{placeins}
\usepackage{tablefootnote}
\usepackage{wrapfig}
\usepackage{array}
\usepackage{tabularx}
\usepackage{tabu}
\usepackage{setspace}
\usepackage{multirow}
\usepackage{rotating}
\usepackage{multirow}
\usepackage{longtable}
\usepackage{enumitem}
\usepackage{pifont}
\usepackage{natbib}
\usepackage{booktabs}
\usepackage{collcell}
\usepackage{datatool}
\usepackage{pdflscape}
\usepackage{graphics}
\setcounter{MaxMatrixCols}{10}
\pagestyle{myheadings} \textheight 8in \textwidth 6.5in
\oddsidemargin -0in \evensidemargin 0in \topmargin 0.1in
\newcommand{\mbf}[1]{\mbox{\boldmath $#1$}}
\newcommand{\thetheorem}{{\thesection. \arabic{theorem}}}
\newcommand{\thelemma}{{\thesection. \arabic{lemma}}}
\newcommand{\theproposition}{{\thesection. \arabic{proposition}}}
\newcommand{\thecorollary}{{\thesection. \arabic{corollary}}}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{lemma}{Lemma}[section]
\newtheorem{corollary}{Corollary}[section]
\newtheorem{remark}{Remark}[section]
\begin{document}
\begin{sidewaystable}[H]
\centering
\renewcommand{\arraystretch}{1}
\caption{Mean and standard deviation of ......AR${(1)}$.}
\begin{center}
\begin{adjustbox}{width=1\textwidth, center}
\begin{tabular}{|c| c| c| c| c| c| c| c| c| c| c| c| c| c| c| c| c| c| c| c| c| c|}
\hline \hline
\multirow{3}{7em}{ \centering True Value}
& \multirow{3}{4em}{\centering Method}
& \multicolumn{20}{c|}{ Sample Size ${n}$} \\
\cline{3-22}
& & \multicolumn{5}{c|}{\makecell{ ${50}$}}
& \multicolumn{5}{c|}{\makecell{ ${100}$}}
& \multicolumn{5}{c|}{\makecell{ ${500}$}}
& \multicolumn{5}{c|}{\makecell{ ${1000}$}}\\
\cline{3-22}
& & AIC & AIC$_{c}$ & BIC & LASSO & LASSO $^{*}$ & AIC & AIC$_{c}$ & BIC & LASSO & LASSO $^{*}$& AIC & AIC$_{c}$ & BIC & LASSO & LASSO $^{*}$& AIC & AIC$_{c}$ & BIC & LASSO & LASSO $^{*}$\\
\hline \hline
${\phi=0.2}$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
\\ \hline \hline
${\phi=0.2}$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
\\ \hline \hline
${\phi=0.2}$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
\\ \hline \hline
${\phi=0.2}$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
\\ \hline \hline
${\phi=0.2}$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
\\ \hline \hline
${\phi=0.2}$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of beta
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%mean of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
%sd of phi
{} & \begin{tabular}[c]{@{}c@{}}
${0.9254 \pm 0.9254 }$\\${0.9254 \pm 0.9254 }$
\end{tabular}
\\ \hline \hline
\end{tabular}
\end{adjustbox}
\end{center}
%\label{table:table2.1}
\end{sidewaystable}
\end{document}
答案1
一些意见和建议：
正如您和其他人已经指出的那样，该表实在太大，无法放在一页上。将其分成 4 个子表（分别对应 n=50、100、500 和 1000）似乎是绝对必要的。
在继续介绍表格的细节之前，我不得不说，你的文档的序言太乱了。加载包两次、三次、四次甚至更多次是没有道理的。加载
hyperref包最后的. 学会使用geometry软件包。并且，不要加载过时和弃用的subfigure软件包。
我尝试改进以下代码中的前言部分。你越早说服自己不需要所有剩余的\usepackage指令，就越好。
我建议您从环境切换
sidewaystable到table环境。加载subcaption包并使用其机制。对四个子表subtable使用tabular*而不是。进行这些调整后，您仍需要切换到相对字体大小；但是，这不会影响表格材料的基本可读性。请注意，相关材料已消失。tabular\smalladjustbox\toprule通过 (a) 省略所有垂直线和 (b) 使用更少但间距更大的由、\midrule和生成的水平线\bottomrule，可以使表格看起来更加开放。尝试尽可能减少代码混乱。例如，
True Value不要写 ，而要写$\phi$。还请尝试改掉不必要地用花括号括住大量数学模式对象的习惯。例如，不要${50}$写 ，而要写$50$。
下面的截图展示了结果子表（a）和（c）的前几行。
\documentclass[12pt]{article}
\usepackage{eurosym}
\usepackage{amsthm}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{lemma}{Lemma}[section]
\newtheorem{corollary}{Corollary}[section]
\newtheorem{remark}{Remark}[section]
\usepackage{amssymb,amsmath}
\setcounter{MaxMatrixCols}{10}
\usepackage{xcolor}
\usepackage{graphicx}
\usepackage{float}
\usepackage{indentfirst}
\usepackage{bm}
\usepackage{makecell, multirow}
\usepackage{longtable}
\usepackage{booktabs}
\usepackage{rotating}
\usepackage{rotfloat}
\usepackage{placeins}
\usepackage{tablefootnote}
\usepackage{wrapfig}
\usepackage{array}
\usepackage{tabularx}
\usepackage{setspace}
\usepackage{enumitem}
\usepackage{pifont}
\usepackage{natbib}
\usepackage{collcell}
\usepackage{datatool}
\usepackage{csvsimple}
\usepackage{pdflscape}
\usepackage{subcaption} % <-- new
\pagestyle{myheadings}
\usepackage[letterpaper,textheight=9in,textwidth=6.5in]{geometry}
\usepackage{hyperref} % load this package _LAST_
\newcommand{\mbf}[1]{\mbox{\boldmath $#1$}}
\begin{document}
\begin{table}[p] % place the float on a page by itself
\caption{Means and standard deviations of \dots}
%% ironically, you don't show standard deviations anywhere in the tables
\label{table:2.1}
\small
\setlength\tabcolsep{0pt}
\begin{subtable}{\textwidth}
\caption{$n=50$}
\begin{tabular*}{\textwidth}{@{\extracolsep{\fill}} ll ccccc @{}}
\toprule
$\phi$ & Method & AIC & AIC$_{c}$ & BIC & LASSO & LASSO$^{*}$
\\
\midrule
$0.2$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.4$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.6$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.8$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.9$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.95$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\bottomrule
\end{tabular*}
\end{subtable}
%%%%%%%
\vspace{1cm}
\begin{subtable}{\textwidth}
\caption{$n=100$}
\begin{tabular*}{\textwidth}{@{\extracolsep{\fill}} ll ccccc @{}}
\toprule
$\phi$ & Method & AIC & AIC$_{c}$ & BIC & LASSO & LASSO$^{*}$
\\
\midrule
$0.2$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.4$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.6$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.8$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.9$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.95$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\bottomrule
\end{tabular*}
\end{subtable}
\end{table}
\begin{table}[p]
\ContinuedFloat
\caption{Means and standard deviations of \dots, continued}
\small
\setlength\tabcolsep{0pt}
\begin{subtable}{\textwidth}
\caption{$n=500$}
\begin{tabular*}{\textwidth}{@{\extracolsep{\fill}} ll ccccc @{}}
\toprule
$\phi$ & Method & AIC & AIC$_{c}$ & BIC & LASSO & LASSO$^{*}$
\\
\midrule
$0.2$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.4$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.6$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.8$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.9$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.95$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\bottomrule
\end{tabular*}
\end{subtable}
%%%%%%%
\vspace{1cm}
\begin{subtable}{\textwidth}
\caption{$n=1000$}
\begin{tabular*}{\textwidth}{@{\extracolsep{\fill}} ll ccccc @{}}
\toprule
$\phi$ & Method & AIC & AIC$_{c}$ & BIC & LASSO & LASSO$^{*}$
\\
\midrule
$0.2$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.4$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.6$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.8$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.9$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\addlinespace
$0.95$
&\begin{tabular}[c]{@{}c@{}}
One-step\\ Two-step
\end{tabular}
%mean of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of beta
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%mean of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
%sd of phi
& \begin{tabular}[c]{@{}c@{}}
$0.925\pm 0.925$\\$0.925\pm 0.925$
\end{tabular}
\\
\bottomrule
\end{tabular*}
\end{subtable}
\end{table}
\end{document}
答案2
作为对 nice 的补充@MIco 回答. 使用 loaded包并重新组织表中的multirow所有嵌套行后，代码表代码会变得更短：\tabulars
\documentclass[12pt]{article}
\usepackage[letterpaper,textheight=9in,textwidth=6.5in]{geometry}
\usepackage{eurosym, pifont}
\usepackage{bm}
\usepackage{amsmath, amssymb, amsthm}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{lemma}{Lemma}[section]
\newtheorem{corollary}{Corollary}[section]
\newtheorem{remark}{Remark}[section]
\setcounter{MaxMatrixCols}{10}
\usepackage{xcolor}
\usepackage{graphicx}
\usepackage{float}
\usepackage{indentfirst}
\usepackage{rotating}
\usepackage{booktabs, collcell, longtable, makecell, multirow, tabularx}
\usepackage{rotfloat}
\usepackage{placeins}
\usepackage{tablefootnote}
\usepackage{wrapfig}
\usepackage{setspace}
\usepackage{enumitem}
\usepackage{natbib}
\usepackage{datatool}
\usepackage{csvsimple}
\usepackage{pdflscape}
\usepackage{subcaption} % <-- new
\pagestyle{myheadings}
\usepackage{hyperref} % load this package _LAST_
\newcommand{\mbf}[1]{\mbox{\boldmath $#1$}}
\begin{document}
\begin{table}[p]
\caption{Means and standard deviations of \dots}
\label{table:2.1}
\small
\setlength\tabcolsep{0pt}
\begin{subtable}{\textwidth}
\caption{$n=50$}
\begin{tabular*}{\textwidth}{@{\extracolsep{\fill}} ll *{5}{>{$}c<{$} }}
\toprule
$\phi$ & Method & \text{AIC} & \text{AIC}_{c}
& \text{BIC} & \text{LASSO} & \text{LASSO}^{*} \\
\midrule
\multirow{2}{*}{$0.2$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.4$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.6$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.8$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.9$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.95$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\bottomrule
\end{tabular*}
\end{subtable}
\vspace{1cm}
\begin{subtable}{\textwidth}
\caption{$n=100$}
\begin{tabular*}{\textwidth}{@{\extracolsep{\fill}} ll *{5}{>{$}c<{$} }}
\toprule
$\phi$ & Method & \text{AIC} & \text{AIC}_{c}
& \text{BIC} & \text{LASSO} & \text{LASSO}^{*} \\
\midrule
\multirow{2}{*}{$0.2$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.4$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.6$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.8$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.9$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.95$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\bottomrule
\end{tabular*}
\end{subtable}
\end{table}
\begin{table}[p]
\ContinuedFloat
\caption{Means and standard deviations of \dots}
\label{table:2.1}
\small
\setlength\tabcolsep{0pt}
\begin{subtable}{\textwidth}
\caption{$n=500$}
\begin{tabular*}{\textwidth}{@{\extracolsep{\fill}} ll *{5}{>{$}c<{$} }}
\toprule
$\phi$ & Method & \text{AIC} & \text{AIC}_{c}
& \text{BIC} & \text{LASSO} & \text{LASSO}^{*} \\
\midrule
\multirow{2}{*}{$0.2$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.4$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.6$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.8$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.9$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.95$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\bottomrule
\end{tabular*}
\end{subtable}
\vspace{1cm}
\begin{subtable}{\textwidth}
\caption{$n=1000$}
\begin{tabular*}{\textwidth}{@{\extracolsep{\fill}} ll *{5}{>{$}c<{$} }}
\toprule
$\phi$ & Method & \text{AIC} & \text{AIC}_{c}
& \text{BIC} & \text{LASSO} & \text{LASSO}^{*} \\
\midrule
\multirow{2}{*}{$0.2$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.4$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.6$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.8$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.9$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\addlinespace
\multirow{2}{*}{$0.95$}
& One-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
& Two-step & 0.925\pm 0.925 & 0.925\pm 0.925
& 0.925\pm 0.925 & 0.925\pm 0.925 & 0.925\pm 0.925 \\
\bottomrule
\end{tabular*}
\end{subtable}
\end{table}
\end{document}
