# How to increase the height of the rows in latex tables?

I have a bit problem, my table is bit large and I used the command

\resizebox{\columnwidth}{!}


to fit it the paper, however, this result in bad row height, so how can I solve this issues.

Here you are the code

\begin{table}[H]
\caption{Reduct size}
\resizebox{\columnwidth}{!}{
\centering
\begin{tabular}{|l|c|c|c|c|c|c|c|c|c|c|c|c|}
\hline
Data&\multicolumn{6}{c|}{NRB}&\multicolumn{3}{c|}     {PCA}&Correlation&Consistency&MrMr\\
\cline{2-11}
&\multicolumn{3}{c|}{$\delta =$0.1}&\multicolumn{3}{c|}{$\delta =$0.2}&$variance =$0.75&$variance =$0.85&$variance =$0.95&&&\\
\cline{2-7}
&$\epsilon =$0.2&$\epsilon =$0.4&$\epsilon =$0.6&$\epsilon =$0.2&$\epsilon =$0.4&$\epsilon =$0.6&&&&&&\\\hline
Horse&8(2)&9(3)&8(2)&13(5)&13(5)&8(2)&13(5)&17(6)&23(7)&3(1)&10(4)&3(1)\\
\hline
Ionosphere&10(4)&8(3)&1(1)&12(6)&11(5)&1(1)&11(5)&17(9)&26(10)&14(7)&5(2)&16(8)\\\hline
Band&6(2)&5(1)&12(5)&6(2)&12(5)&14(7)&10(4)&13(6)&15(8)&5(1)&9(3)&9(3)\\
\hline
Australian&4(1)&4(1)&4(1)&4(1)&4(1)&4(1)&9(3)&11(4)&13(5)&7(2)&9(3)&7(2)\\
\hline
Hepatitis&8(4)&6(3)&4(1)&9(5)&6(3)&4(1)&9(5)&12(6)&16(7)&4(1)&5(2)&9(5)\\\hline
Credit&11(4)&11(4)&11(4)&13(5)&15(6)&11(4)&9(2)&11(4)&13(5)&7(1)&10(3)&7(1)\\\hline
Wine&7(5)&5(3)&1(1)&6(4)&2(2)&2(2)&5(3)&8(6)&10(7)&8(6)&8(6)&13(7)\\\hline
Anneal&33(9)&31(8)&6(1)&33(9)&29(7)&6(1)&15(4)&19(5)&24(6)&6(1)&8(2)&10(3)\\\hline
Arrhythmia&3(1)&4(2)&5(3)&3(1)&4(2)&12(6)&57(9)&82(10)&130(11)&20(7)&20(7)&21(8)\\\hline
Echocardiogram&1(1)&1(1)&1(1)&1(1)&1(1)&1(1)&7(5)&8(6)&10(7)&4(3)&3(2)&5(4)\\\hline
Diabetic&16(6)&17(7)&13(5)&19(8)&19(8)&13(5)&5(1)&7(3)&9(4)&6(2)&9(4)&6(2)\\
\hline
\end{tabular}
}
\end{table}

• It is best never to scale tables using \resizebox, but if you do beware white space {\columnwidth}{!}{ \centering forces a spurious space before the table from the missing % after { (you also have a spurious space at the end) and \centering does nothing as \resizebox is a horizontal box like \mbox – David Carlisle Jul 28 '16 at 12:40
• This table really is too wide. I think it would be better to typeset it in a different way. Maybe plotting it in a graph would be better. Or splitting it into two or more separate tables. Or, maybe reverse the rows/columns, so that it becomes a longtable instead. If you really want to squeeze all that data in horizontally, you could use makebox[0pt][c]{\begin{tabular}\end{tabular}} with the fontsize \tiny – Runar Jul 28 '16 at 12:50

there is no need to apply scaling, just choose a suitable font size, also spacing around the = was off as the math mode was used inconsistently

You can increase the row size using \arraystretch or as here using the array package \extrarowheight.

\documentclass[a4paper,dvipsnames]{article}
\usepackage[utf8]{inputenc}
\usepackage{graphicx,color,caption}
\usepackage{array}
\usepackage[left=2cm,right=2cm,top=1.5cm,bottom=1.5cm]{geometry}
\captionsetup{justification=centering}
\begin{document}

\begin{table}
\caption{Reduct size}
\setlength\tabcolsep{3pt}
\setlength\extrarowheight{2pt}
\centering\footnotesize
\begin{tabular}{@{}|l|c|c|c|c|c|c|c|c|c|c|c|c|@{}}
\hline
Data&\multicolumn{6}{c|}{NRB}&\multicolumn{3}{c|}     {PCA}&Correlation&Consistency&MrMr\\
\cline{2-11}
&\multicolumn{3}{c|}{$\delta = 0.1$}&
\multicolumn{3}{c|}{$\delta = 0.2$}&
\multicolumn{3}{c|}{variance}&&&\\
\cline{2-10}
&$\epsilon = 0.2$&$\epsilon = 0.4$&$\epsilon = 0.6$&$\epsilon = 0.2$&$\epsilon = 0.4$&$\epsilon = 0.6$&
0.75&0.85&0.95&&&\\\hline
Horse&8(2)&9(3)&8(2)&13(5)&13(5)&8(2)&13(5)&17(6)&23(7)&3(1)&10(4)&3(1)\\
\hline
Ionosphere&10(4)&8(3)&1(1)&12(6)&11(5)&1(1)&11(5)&17(9)&26(10)&14(7)&5(2)&16(8)\\\hline
Band&6(2)&5(1)&12(5)&6(2)&12(5)&14(7)&10(4)&13(6)&15(8)&5(1)&9(3)&9(3)\\
\hline
Australian&4(1)&4(1)&4(1)&4(1)&4(1)&4(1)&9(3)&11(4)&13(5)&7(2)&9(3)&7(2)\\
\hline
Hepatitis&8(4)&6(3)&4(1)&9(5)&6(3)&4(1)&9(5)&12(6)&16(7)&4(1)&5(2)&9(5)\\\hline
Credit&11(4)&11(4)&11(4)&13(5)&15(6)&11(4)&9(2)&11(4)&13(5)&7(1)&10(3)&7(1)\\\hline
Wine&7(5)&5(3)&1(1)&6(4)&2(2)&2(2)&5(3)&8(6)&10(7)&8(6)&8(6)&13(7)\\\hline
Anneal&33(9)&31(8)&6(1)&33(9)&29(7)&6(1)&15(4)&19(5)&24(6)&6(1)&8(2)&10(3)\\\hline
Arrhythmia&3(1)&4(2)&5(3)&3(1)&4(2)&12(6)&57(9)&82(10)&130(11)&20(7)&20(7)&21(8)\\\hline
Echocardiogram&1(1)&1(1)&1(1)&1(1)&1(1)&1(1)&7(5)&8(6)&10(7)&4(3)&3(2)&5(4)\\\hline
Diabetic&16(6)&17(7)&13(5)&19(8)&19(8)&13(5)&5(1)&7(3)&9(4)&6(2)&9(4)&6(2)\\
\hline
\end{tabular}