\begin{tabular}{l c c c c c c c c}
\multicolumn{9}{c}{Panel A - length and quantity} \\

\toprule
	& \multicolumn{2}{c}{\textbf{mistake}}	& \multicolumn{2}{c}{time}	& \multicolumn{2}{c}{\textbf{cost}}	& \multicolumn{2}{c}{importance} \\
\midrule
Variable	& \textbf{length} & \textbf{quantity}	& length & quantity	& \textbf{length} & \textbf{quantity}	& length & quantity \\
Standardized coeff.	& \textbf{-0.03} & \textbf{0.28}	& 0.29 & 0.17 	& \textbf{-0.00} & \textbf{0.45}	& 0.71 & -0.43 \\
p-value	& \textbf{0.53} & \textbf{0.00}	& 0.00 & 0.02 	& \textbf{1.00} & \textbf{0.00}	& 0.00 & 0.05 \\
Contribution to ^2$	& \textbf{-2\%} & \textbf{17\%}	& 24\% & 14\% 	& \textbf{-0\%} & \textbf{89\%}	& 154\% & -54\% \\
\bottomrule
 & & & & & & & & \\
\multicolumn{9}{c}{Panel B - length and potential} \\

\toprule
	& \multicolumn{2}{c}{mistake}	& \multicolumn{2}{c}{\textbf{time}}	& \multicolumn{2}{c}{cost}	& \multicolumn{2}{c}{\textbf{importance}} \\
\midrule
Variable	& length & potential	& \textbf{length} & \textbf{potential}	& length & potential	& \textbf{length} & \textbf{potential} \\
Standardized coeff.	& 0.16 & 0.05 	& \textbf{0.07} & \textbf{0.40}	& 0.32 & 0.14 	& \textbf{0.11} & \textbf{0.42} \\
p-value	& 0.03 & 0.47 	& \textbf{0.42} & \textbf{0.00}	& 0.00 & 0.08 	& \textbf{0.18} & \textbf{0.00} \\
Contribution to ^2$	& 8\% & 3\% 	& \textbf{6\%} & \textbf{33\%}	& 65\% & 23\% 	& \textbf{15\%} & \textbf{85\%} \\
\bottomrule
\end{tabular}
