如何使值居中以使表格看起来更好看，这是我的建议和输出。
\documentclass[12pt,notitlepage]{article}
\usepackage[margin=2cm]{geometry}
\usepackage{booktabs} % For better looking tables
\usepackage{natbib}
\usepackage{amsmath}
\usepackage{lmodern}
\usepackage[utf8]{inputenc}
\usepackage{enumitem}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}
\usepackage{graphicx}
\usepackage{amssymb}
\usepackage{mathtools}
\usepackage{array}
\usepackage[figurename=Fig.,skip=0.333\baselineskip]{caption}
\usepackage[english]{babel}
\usepackage{siunitx}
\newcolumntype{T}[1]{S[table-format=#1,group-separator={,},group-minimum-digits=3]}
\newcolumntype{U}[1]{S[table-format=#1,round-precision=2,round-mode=places]}
\begin{document}
\begin{table}[ht]
\caption{Descriptive statistics}
\label{tab:tab_Descriptive statistics}
\centering
\begin{tabular}{@{} l U{3.0} U{4.2}U{4.2} U{4.2} U{4.2} @{}}
\toprule
Variables & {Price} & {Open} & {High} & {Low} & {Vol}& \\
\cmidrule(lr){2-2} \cmidrule(lr){3-3} \cmidrule(lr){4-4}
\cmidrule(lr){5-5} \cmidrule(l){6-6}
No of obs. & 3643 & 3643 & 3643 & 3643 & 3643\\
Mean & 70.814 & 70.83 & 71.885 & 69.687 & \\
St.\ Dev. & 23.701979& 23.65 & 23.768370& 23.543701& 100\\
Miximum &-37.63 & -14.0 & 13.69 & -40.32 & 100\\
Manimum & 145.29 & 145.19 & 147.27 & 143.22 & 100\\
25\% & 50.99 & 51.0 &51.98 & 50.13 & 10\\
50\% & 68.10 & 68.15 & 69.31 & 67.0 & 100\\
75\% & 91.86 & 91.77 & 92.92 & 90.70 & 100\\
\bottomrule
\end{tabular}
\end{table}
\end{document}
输出 ：
答案1
您需要将数字括No of obs.在花括号中：
\documentclass[12pt]{article}
\usepackage[margin=2cm]{geometry}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}
\usepackage{booktabs} % For better looking tables
\usepackage[figurename=Fig.,skip=0.333\baselineskip]{caption}
\usepackage{siunitx}
\begin{document}
\begin{table}[ht]
\caption{Descriptive statistics}
\label{tab:tab_Descriptive statistics}
\centering
\begin{tabular}{@{} l *{4}{S[table-format=3.2,
round-mode=places,
round-precision=2]}
S[table-format=2]
@{}}
\toprule
Variables & {Price} & {Open} & {High} & {Low} & {Vol} \\ % <---
\midrule
No of obs. & {3643} & {3643} & {3643} & {3643} & {3643}\\
Mean & 70.814 & 70.83 & 71.885 & 69.687 & \\
St. Dev. & 23.701979 & 23.65 & 23.768370 & 23.543701 & 100 \\
Miximum &-37.63 & -14.0 & 13.69 & -40.32 & 100 \\
Manimum & 145.29 & 145.19 & 147.27 & 143.22 & 100 \\
\qty{25}{\%} & 50.99 & 51.0 & 51.98 & 50.13 & 10 \\
\qty{55}{\%} & 68.10 & 68.15 & 69.31 & 67.0 & 100 \\
\qty{75}{\%} & 91.86 & 91.77 & 92.92 & 90.70 & 100 \\
\bottomrule
\end{tabular}
\end{table}
\end{document}
