spb/wp7_uqo

1\begin{table}[H]2\centering3\caption{Robustness of return predictability to the standard-error specification.}4\label{tab:robust_se}5\begin{threeparttable}6\footnotesize7\begin{tabular}{@{}lrrrrr@{}}8\toprule9& & \multicolumn{4}{c}{$t$-statistic} \\10\cmidrule(lr){3-6}11Predictor & $b$ (bps) & HC1 & NW(5) & NW(22) & DC \\12\midrule13\multicolumn{6}{@{}l}{\textit{Panel A: 5-day return} ($R^2 = 0.31\%$, $N = 119{,}081$)} \\14$IV_{ATM,30d}$ & 5.02 & 1.99 & 1.17 & 1.08 & 0.80 \\15IV term slope & $-$0.30 & $-$0.19 & $-$0.11 & $-$0.10 & $-$0.07 \\16Skew$_{25\delta}$ & 19.14 & 7.59 & 4.78 & 4.48 & 2.91\sym{***} \\17Implied skewness & $-$8.23 & $-$3.60 & $-$2.46 & $-$2.32 & $-$1.80\sym{*} \\18Implied kurtosis & 3.05 & 2.08 & 1.37 & 1.32 & 0.97 \\19PC volume ratio & 3.04 & 2.86 & 2.20 & 2.08 & 1.66\sym{*} \\20PC OI ratio & $-$4.54 & $-$3.68 & $-$2.19 & $-$1.96 & $-$1.93\sym{*} \\21Net gamma exposure & $-$1.21 & $-$1.18 & $-$0.69 & $-$0.65 & $-$0.90 \\22$RV_t$ & $-$0.69 & $-$0.30 & $-$0.27 & $-$0.28 & $-$0.12 \\23$RV_t^{(w)}$ & 1.02 & 0.42 & 0.29 & 0.28 & 0.14 \\24\addlinespace25\multicolumn{6}{@{}l}{\textit{Panel B: 1-day return} ($R^2 = 0.10\%$, $N = 119{,}081$)} \\26$IV_{ATM,30d}$ & 2.80 & 2.47 & 2.62 & 2.74 & 0.92 \\27IV term slope & 0.81 & 1.17 & 1.24 & 1.27 & 0.43 \\28Skew$_{25\delta}$ & 5.59 & 4.66 & 5.08 & 5.41 & 1.80\sym{*} \\29Implied skewness & $-$2.74 & $-$2.51 & $-$2.72 & $-$2.81 & $-$1.27 \\30Implied kurtosis & 0.32 & 0.45 & 0.49 & 0.50 & 0.20 \\31PC volume ratio & $-$0.01 & $-$0.03 & $-$0.03 & $-$0.03 & $-$0.02 \\32PC OI ratio & $-$0.64 & $-$1.14 & $-$1.18 & $-$1.18 & $-$0.84 \\33Net gamma exposure & 0.05 & 0.11 & 0.11 & 0.12 & 0.11 \\34$RV_t$ & $-$3.21 & $-$2.75 & $-$2.79 & $-$2.79 & $-$0.97 \\35$RV_t^{(w)}$ & $-$0.47 & $-$0.40 & $-$0.41 & $-$0.41 & $-$0.12 \\36\bottomrule37\end{tabular}38\begin{tablenotes}[flushleft]\footnotesize39\item \textit{Notes.} Pooled regressions on the full 69-ticker panel. $b$ is in basis points per standard deviation. HC1: heteroskedasticity-robust \citep{white1980heteroskedasticity}; NW($L$): Newey--West with $L$ lags \citep{newey1987simple}; DC: two-way clustering by ticker and date \citep{cameron2011robust,petersen2009estimating}. Stars refer to the DC statistic: \sym{***}, \sym{**}, \sym{*}: $|t|>2.576$, $1.96$, $1.645$.40\end{tablenotes}41\end{threeparttable}42\end{table}43