问题是整个表格注释与文档中的正常文本一样宽，看起来很糟糕。
您能否帮助我找到一个简单的解决方案，并且对原始代码的改动最小？
非常感谢。
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\begin{document}
The reason why I am doing the sequential sorting with the institutional holding, is that the institutional holding is extremely endogenous in this case - fund managers choose to hold some specific stocks for some reason. So it is more reasonable to condition on the same institutional holding level first, and then explore the effect of concentration.
\begin{table}[htbp]
\centering
\caption{Sorting with Institutional Holding level and Concentration level}
\begin{tablenotes}
\item\small The table reports the equal weighted six-month return with a half-year lag after the assignment of groups for each small-sized stock. At the end to each quarter of year $t$, I sequentially sort all the stocks using market cap (at the end of year $t-1$), the reported institutional holdings and the concentration index. For example, at the end of March in year $t$, the groups are assigned, and the returns are counted from October in year $t$ to March in year $t+1$.
\end{tablenotes}
\begin{tabular}{ccccccc}
\toprule
& & \multicolumn{5}{c}{insti after 1990} \\
\midrule
& & 1 & 2 & 3 & 4 & 5 \\
\multirow{5}[0]{*}{concent} & 1 & 6.55\% & 4.87\% & 2.98\% & 3.11\% & 2.73\% \\
& 2 & 1.11\% & 5.83\% & 3.72\% & 4.07\% & 4.00\% \\
& 3 & 10.61\% & 4.89\% & 6.76\% & 4.64\% & 4.63\% \\
& 4 & 21.42\% & 3.26\% & 6.47\% & 4.01\% & 4.91\% \\
& 5 & 6.81\% & 7.05\% & 5.83\% & 6.21\% & 5.14\% \\
\bottomrule
\end{tabular}%
\label{concent55}
\end{table}
\end{document}
答案1
您应该tablenotes在之后使用tabular，以便的宽度tabular可用并且注释遵循该宽度：
\documentclass[]{article}
\usepackage{showframe}
\usepackage{multirow,booktabs}
\usepackage{threeparttable}
\begin{document}
\begin{table}[htbp]
\centering
\begin{threeparttable}
\caption{Sorting with Institutional Holding level and Informed Change level}
\begin{tabular}{ccccccc}
\toprule
& & \multicolumn{5}{c}{Institution Holding} \\
\midrule
& & 1 & 2 & 3 & 4 & 5 \\
\multicolumn{1}{c}{\multirow{5}[0]{*}{Informed}} & 1 & 0.085772 & 0.06621 & 0.053334 & 0.050598 & 0.043458 \\
\multicolumn{1}{c}{} & 2 & 0.093572 & 0.05932 & 0.023613 & 0.025465 & 0.009882 \\
\multicolumn{1}{c}{} & 3 & 0.068156 & 0.042421 & 0.067455 & 0.047022 & 0.032287 \\
\multicolumn{1}{c}{} & 4 & 0.088821 & 0.062215 & 0.064485 & 0.055428 & 0.068727 \\
\multicolumn{1}{c}{} & 5 & 0.177559 & 0.132563 & 0.108866 & 0.103303 & 0.114933 \\
\bottomrule
\end{tabular}%
\label{informed55}
\begin{tablenotes}[flushleft]
\small
\item The table reports the equal weighted six-month return after the assignment of groups for each small-sized stock. At the end to each quarter of year $t$, I sequentially sort all the stocks using market cap (at the end of year $t-1$), the reported institutional holdings and the informed holding position change index. For example, at the end of March in year $t$, the groups are assigned, and the returns are counted from April in year $t$ to September in year $t+1$.
\end{tablenotes}
\end{threeparttable}
\end{table}
\end{document}
