我怎样才能像本例一样加入表格注释？
现在，我有以下 Tex：
\documentclass[10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{float}
\usepackage{longtable}
\usepackage{dcolumn,booktabs}
\newcolumntype{d}[1]{D{.}{.}{#1}}
\newcommand\mc[1]{\multicolumn{1}{c}{#1}}
\usepackage[top=3.5cm, bottom=4.5cm, left=3.3cm, right=3.3cm]{geometry}
\begin{document}
\begin{table}[H]
\small
\centering
\caption{Granger Causality}
\label{table:grangercausality}
\setlength\tabcolsep{3pt}
\begin{tabular}{l *{11}{d{3.3}}}
\toprule
\hspace{1mm}1 & 2 & 3 & 4 & 5
& 6 & 7 & 8 & 9 & 10
& 11 & 12 \\
\hspace{2.5mm}i & \mc{$\hat{\beta}_{i,AUS}$} &
\mc{$\hat{\beta}_{i,CAN}$} & \mc{$\hat{\beta}_{i,FRA}$} &
\mc{$\hat{\beta}_{i,DEU}$} & \mc{$\hat{\beta}_{i,ITA}$} &
\mc{$\hat{\beta}_{i,JPN}$} & \mc{$\hat{\beta}_{i,NLD}$} &
\mc{$\hat{\beta}_{i,SWE}$} & \mc{$\hat{\beta}_{i,CHE}$} &
\mc{$\hat{\beta}_{i,GBR}$} & \mc{$\hat{\beta}_{i,USA}$} \\
\midrule
AUS & & 0.11^\ast & 0.12^\ast &
0.13^\ast & 0.08^\ast & 0.10^\ast &
0.13^\ast & 0.08^\ast & 0.11^\ast & 0.07
& 0.20^\ast \\
& & (1.35) & (1.96) & (2.06) & (2.24) & (1.91) &
(1.77) & (1.91) & (1.67) & (0.94) & (2.34) \\ \addlinespace
CAN & 0.05 & & 0.06 & 0.06
& 0.06^\ast & 0.06 & 0.06 &
0.15^\ast & 0.08 & 0.07 & 0.21^\ast
\\
& (0.84) & & (1.21) & (1.24) & (1.53) & (1.26) &
(0.79) & (3.73) & (1.00) & (0.99) & (2.19) \\ \addlinespace
FRA & 0.01 & -0.01 & &
-0.03 & -0.05 & 0.04 & 0.002 &
0.14^\ast & 0.16^\ast & 0.03 & 0.12
\\
& (0.15) & (-0.15) & & (-0.31) & (-0.91) & (0.53) &
(0.02) & (2.27) & (1.47) & (0.26) & (1.28) \\ \addlinespace
DEU & 0.03 & 0.09 & 0.13^\ast &
& 0.06 & 0.09^\ast & 0.06 &
0.14^\ast & 0.26^\ast & 0.07 &
0.22^\ast \\
& (0.37) & (1.11) & (1.49) & & (1.29) & (1.42) &
(0.55) & (2.49) & (2.26) & (0.77) & (2.33) \\ \addlinespace
ITA & -0.01 & 0.06 & 0.16^\ast &
0.11 & & 0.05 & -0.06 &
0.06 & 0.21^\ast & 0.15^\ast &
0.15^\ast \\
& (-0.07) & (0.66) & (1.63) & (1.21) & & (0.72) &
(-0.59) & (0.99) & (1.84) & (1.48) & (1.59) \\
\addlinespace
JPN & 0.04 & 0.12^\ast & 0.11^\ast
& 0.02 & 0.03 & & 0.07
& 0.09^\ast & 0.11^\ast & 0.11^\ast &
0.11^\ast \\
& (0.70) & (1.70) & (2.07) & (0.44) & (0.78) & &
(1.17) & (1.77) & (1.61) & (1.71) & (1.48) \\ \addlinespace
NLD & 0.10^\ast & 0.15^\ast & 0.15^\ast
& 0.15^\ast & 0.05 & 0.11^\ast &
& 0.16^\ast & 0.33^\ast & 0.11 &
0.32^\ast \\
& (1.46) & (1.95) & (2.20) & (1.79) & (1.05) & (2.12)
& & (2.76) & (3.28) & (1.11) & (3.69) \\ \addlinespace
SWE & -0.03 & 0.16^\ast & 0.05 &
0.08 & 0.08 & 0.06 & 0.01 &
& 0.12 & 0.10 & 0.23^\ast \\
& (-0.31) & (1.75) & (0.58) & (0.88) & (1.09) & (0.76)
& (0.13) & & (1.23) & (0.90) & (2.22) \\ \addlinespace
CHE & 0.03 & 0.03 & -0.0003 &
-0.02 & 0.00 & 0.02 & -0.01 &
0.13^\ast & & 0.02 & 0.14^\ast
\\
& (0.50) & (0.41) & (0.07) & (-0.20) & (-0.08) & (0.51)
& (-0.08) & (3.14) & & (0.32) & (1.67) \\\addlinespace
GBR & 0.11^\ast & 0.08 & 0.08 &
0.02 & 0.01 & 0.09^\ast & -0.02
& 0.09^\ast & 0.11^\ast & &
0.23^\ast \\
& (1.74) & (1.02) & (1.17) & (0.26) & (0.24) & (1.85)
& (-0.18) & (2.03) & (1.42) & & (2.26) \\\addlinespace
USA & 0.06 & 0.03 & 0.01 &
-0.01 & 0.06^\ast & -0.0003 & 0.01
& 0.09^\ast & 0.04 & 0.02 &
\\
& (1.00) & (0.27) & (0.20) & (-0.20) & (1.52) & (-0.01)
& (0.18) & (2.31) & (0.48) & (0.22) & \\ \addlinespace
Average & 0.04 & 0.08 & 0.09 &
0.05 & 0.04 & 0.06 & 0.03 &
0.11 & 0.15 & 0.08 & 0.19 \\
\addlinespace
Pooled & 0.03 & 0.07^\ast & 0.08^\ast
& 0.05 & 0.04^\ast & 0.06^\ast &
0.02 & 0.11^\ast & 0.13^\ast &
0.08^\ast & 0.17^\ast \\
& (0.65) & (1.34) & (2.02) & (1.08) & (1.32) & (1.52)
& (0.42) & (3.56) & (2.22) & (1.45) & (2.98) \\
\bottomrule
\end{tabular}
\end{table}
\end{document}
非常感谢您帮助我！
答案1
编辑： 像这样？
我在上面的评论中提到过，您可以使用注释\multicolumn{12}{>{\linespread{0.8}\footnotesize}p{\linewidth}}{...}。使用\linespread{0.8}in 可以减少文本行之间的垂直空间：
\documentclass[10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{float}
\usepackage{longtable}
\usepackage{dcolumn,booktabs}
\newcolumntype{d}[1]{D{.}{.}{#1}}
\newcommand\mc[1]{\multicolumn{1}{c}{#1}}
\usepackage[top=3.5cm, bottom=4.5cm, left=3.3cm, right=3.3cm]{geometry}
\usepackage{lipsum}
\begin{document}
\begin{table}[H]
\small
\centering
\caption{Granger Causality}
\label{table:grangercausality}
\setlength\tabcolsep{3pt}
\begin{tabular}{l *{11}{d{3.3}}}
\multicolumn{12}{>{\linespread{0.8}\footnotesize}p{\linewidth}}{\lipsum[11]}\\
\toprule
\hspace{1mm}1 & 2 & 3 & 4 & 5
& 6 & 7 & 8 & 9 & 10
& 11 & 12 \\
\hspace{2.5mm}i & \mc{$\hat{\beta}_{i,AUS}$} &
\mc{$\hat{\beta}_{i,CAN}$} & \mc{$\hat{\beta}_{i,FRA}$} &
\mc{$\hat{\beta}_{i,DEU}$} & \mc{$\hat{\beta}_{i,ITA}$} &
\mc{$\hat{\beta}_{i,JPN}$} & \mc{$\hat{\beta}_{i,NLD}$} &
\mc{$\hat{\beta}_{i,SWE}$} & \mc{$\hat{\beta}_{i,CHE}$} &
\mc{$\hat{\beta}_{i,GBR}$} & \mc{$\hat{\beta}_{i,USA}$} \\
\midrule
AUS & & 0.11^\ast & 0.12^\ast &
0.13^\ast & 0.08^\ast & 0.10^\ast &
0.13^\ast & 0.08^\ast & 0.11^\ast & 0.07
& 0.20^\ast \\
& & (1.35) & (1.96) & (2.06) & (2.24) & (1.91) &
(1.77) & (1.91) & (1.67) & (0.94) & (2.34) \\ \addlinespace
CAN & 0.05 & & 0.06 & 0.06
& 0.06^\ast & 0.06 & 0.06 &
0.15^\ast & 0.08 & 0.07 & 0.21^\ast
\\
& (0.84) & & (1.21) & (1.24) & (1.53) & (1.26) &
(0.79) & (3.73) & (1.00) & (0.99) & (2.19) \\ \addlinespace
FRA & 0.01 & -0.01 & &
-0.03 & -0.05 & 0.04 & 0.002 &
0.14^\ast & 0.16^\ast & 0.03 & 0.12
\\
& (0.15) & (-0.15) & & (-0.31) & (-0.91) & (0.53) &
(0.02) & (2.27) & (1.47) & (0.26) & (1.28) \\ \addlinespace
DEU & 0.03 & 0.09 & 0.13^\ast &
& 0.06 & 0.09^\ast & 0.06 &
0.14^\ast & 0.26^\ast & 0.07 &
0.22^\ast \\
& (0.37) & (1.11) & (1.49) & & (1.29) & (1.42) &
(0.55) & (2.49) & (2.26) & (0.77) & (2.33) \\ \addlinespace
ITA & -0.01 & 0.06 & 0.16^\ast &
0.11 & & 0.05 & -0.06 &
0.06 & 0.21^\ast & 0.15^\ast &
0.15^\ast \\
& (-0.07) & (0.66) & (1.63) & (1.21) & & (0.72) &
(-0.59) & (0.99) & (1.84) & (1.48) & (1.59) \\
\addlinespace
JPN & 0.04 & 0.12^\ast & 0.11^\ast
& 0.02 & 0.03 & & 0.07
& 0.09^\ast & 0.11^\ast & 0.11^\ast &
0.11^\ast \\
& (0.70) & (1.70) & (2.07) & (0.44) & (0.78) & &
(1.17) & (1.77) & (1.61) & (1.71) & (1.48) \\ \addlinespace
NLD & 0.10^\ast & 0.15^\ast & 0.15^\ast
& 0.15^\ast & 0.05 & 0.11^\ast &
& 0.16^\ast & 0.33^\ast & 0.11 &
0.32^\ast \\
& (1.46) & (1.95) & (2.20) & (1.79) & (1.05) & (2.12)
& & (2.76) & (3.28) & (1.11) & (3.69) \\ \addlinespace
SWE & -0.03 & 0.16^\ast & 0.05 &
0.08 & 0.08 & 0.06 & 0.01 &
& 0.12 & 0.10 & 0.23^\ast \\
& (-0.31) & (1.75) & (0.58) & (0.88) & (1.09) & (0.76)
& (0.13) & & (1.23) & (0.90) & (2.22) \\ \addlinespace
CHE & 0.03 & 0.03 & -0.0003 &
-0.02 & 0.00 & 0.02 & -0.01 &
0.13^\ast & & 0.02 & 0.14^\ast
\\
& (0.50) & (0.41) & (0.07) & (-0.20) & (-0.08) & (0.51)
& (-0.08) & (3.14) & & (0.32) & (1.67) \\\addlinespace
GBR & 0.11^\ast & 0.08 & 0.08 &
0.02 & 0.01 & 0.09^\ast & -0.02
& 0.09^\ast & 0.11^\ast & &
0.23^\ast \\
& (1.74) & (1.02) & (1.17) & (0.26) & (0.24) & (1.85)
& (-0.18) & (2.03) & (1.42) & & (2.26) \\\addlinespace
USA & 0.06 & 0.03 & 0.01 &
-0.01 & 0.06^\ast & -0.0003 & 0.01
& 0.09^\ast & 0.04 & 0.02 &
\\
& (1.00) & (0.27) & (0.20) & (-0.20) & (1.52) & (-0.01)
& (0.18) & (2.31) & (0.48) & (0.22) & \\ \addlinespace
Average & 0.04 & 0.08 & 0.09 &
0.05 & 0.04 & 0.06 & 0.03 &
0.11 & 0.15 & 0.08 & 0.19 \\
\addlinespace
Pooled & 0.03 & 0.07^\ast & 0.08^\ast
& 0.05 & 0.04^\ast & 0.06^\ast &
0.02 & 0.11^\ast & 0.13^\ast &
0.08^\ast & 0.17^\ast \\
& (0.65) & (1.34) & (2.02) & (1.08) & (1.32) & (1.52)
& (0.42) & (3.56) & (2.22) & (1.45) & (2.98) \\
\bottomrule
\end{tabular}
\end{table}
\end{document}
虽然不是很优雅，但是它可以起作用......