\begin{table}[htbp]\centering\small
\caption{Sector (SIC division) and ETF category counts in the universe}
\label{tab:universe_groups}
\begin{tabular}{llr}
\toprule
Asset class & Group & $n$ \\
\midrule
etf & broad\_equity & 12 \\
etf & commodity & 5 \\
etf & fixed\_income & 8 \\
etf & international & 13 \\
etf & leveraged\_inverse & 14 \\
etf & other & 10 \\
etf & sector & 10 \\
etf & volatility\_alt & 3 \\
stock & construction & 13 \\
stock & finance\_insurance\_realestate & 30 \\
stock & manufacturing & 34 \\
stock & mining & 19 \\
stock & retail & 26 \\
stock & services & 32 \\
stock & transport\_utilities & 32 \\
stock & unknown & 25 \\
stock & wholesale & 14 \\
\bottomrule
\end{tabular}
\end{table}