spb/wp7_uqo

1\begin{table}[H]2\centering3\caption{Descriptive statistics by asset group.}4\label{tab:desc_groups}5\begin{threeparttable}6\small7\begin{tabular}{@{}lrrrr@{}}8\toprule9& Stocks & ETFs & Indices & All \\10\midrule11$N$ (ticker-days) & 188{,}093 & 64{,}256 & 12{,}034 & 264{,}383 \\12$N$ tickers & 49 & 17 & 3 & 69 \\13Mean $IV_{ATM,30d}$ & 0.2664 & 0.1784 & 0.1823 & 0.2406 \\14Mean skew$_{25\delta}$ & 0.0361 & 0.0425 & 0.0562 & 0.0387 \\15Mean PC volume ratio & 0.890 & 2.345 & 1.754 & 1.283 \\16Mean daily RV ($\times 10^{4}$) & 4.86 & 2.00 & 1.35 & 4.01 \\17Mean daily return (\%) & 0.054 & 0.035 & 0.047 & 0.049 \\18Std.\ daily return (\%) & 1.90 & 1.25 & 1.29 & 1.74 \\19\bottomrule20\end{tabular}21\begin{tablenotes}[flushleft]\footnotesize22\item \textit{Notes.} Sample period: January 2010--December 2025. $IV_{ATM,30d}$ is the 30-day at-the-money call implied volatility. Skew is the 25-delta put minus 25-delta call IV. PC volume ratio is total put volume over total call volume. RV is the realized variance from 5-minute returns; the daily return is the sum of 5-minute log returns.23\end{tablenotes}24\end{threeparttable}25\end{table}26